diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
index 7295dc2..e07ba87 100644
--- a/.github/workflows/release.yml
+++ b/.github/workflows/release.yml
@@ -7,7 +7,7 @@ on:
   workflow_dispatch:
     inputs:
       tag:
-        description: "Release tag to create/update, for example v1.5.0"
+        description: "Release tag to create/update, for example v1.6.0"
         required: false
         type: string
       draft:
@@ -116,6 +116,13 @@ jobs:
           test -x "$sdk_dst/bin/orbis-clang"
           echo "PS4_PAYLOAD_SDK=$sdk_dst" >> "$GITHUB_ENV"
 
+      - name: Install PacBrew PS4 portlibs (libcurl)
+        if: matrix.platform == 'ps4' && matrix.zhttpd == '1'
+        run: |
+          set -euo pipefail
+          bash tools/fetch_pacbrew_ps4.sh "$GITHUB_WORKSPACE/pacbrew-ps4-openorbis"
+          echo "PS4_PACBREW_ROOT=$GITHUB_WORKSPACE/pacbrew-ps4-openorbis" >> "$GITHUB_ENV"
+
       - name: Install PS5 PacBrew SDK bundle
         if: matrix.platform == 'ps5'
         run: |
@@ -139,6 +146,13 @@ jobs:
           test -f "$sdk_dst/target/user/homebrew/etc/ca-bundle.crt"
           echo "PS5_PAYLOAD_SDK=$sdk_dst" >> "$GITHUB_ENV"
 
+      - name: Build PS5 BitTorrent engine
+        if: matrix.platform == 'ps5' && matrix.zhttpd == '1'
+        run: |
+          set -euo pipefail
+          sudo apt-get install -y libboost-dev
+          bash tools/build_ps5_libtorrent.sh "$PS5_PAYLOAD_SDK"
+
       - name: Build release variant
         run: |
           set -euo pipefail
@@ -159,6 +173,7 @@ jobs:
               ENABLE_ZHTTPD="${{ matrix.zhttpd }}" \
               ENABLE_MCP=0 \
               ENABLE_PKG_INSTALL=0 \
+              ENABLE_LIBTORRENT="${{ matrix.zhttpd }}" \
               clean all
           else
             make \
diff --git a/.gitignore b/.gitignore
index 2d8ccd9..96627f9 100644
--- a/.gitignore
+++ b/.gitignore
@@ -56,6 +56,7 @@ dkms.conf
 .DS_Store
 /external/ps4-payload-sdk
 /external/ps5-payload-sdk
+/external/pacbrew
 /external/ftpsrv-master
 /build
 /external/ps3libraries-master
@@ -97,3 +98,4 @@ race
 log.txt
 /git-patch
 *.bak
+/.commandcode
diff --git a/Makefile b/Makefile
index b6d43af..fca841c 100644
--- a/Makefile
+++ b/Makefile
@@ -67,7 +67,9 @@ ifeq ($(TARGET),ps4)
     export LLVM_CONFIG := $(ORBIS_LLVM_CONFIG)
     include $(PS4_PAYLOAD_SDK)/toolchain/orbis.mk
     PLATFORM_DEFS := -DPLATFORM_PS4 -DPS4
-    PLATFORM_LIBS := -lkernel -lpthread -lSceSysmodule -lSceSystemService -lSceUserService
+    # SceSysmodule is loaded at runtime with dlopen: the payload SDK does not
+    # ship a linkable library for it.
+    PLATFORM_LIBS := -lkernel -lpthread -lSceSystemService -lSceUserService
     PLATFORM_LDFLAGS :=
 endif
 
@@ -109,6 +111,7 @@ endif
 
 # Default to GCC if no target matched
 CC ?= gcc
+CXX ?= c++
 PLATFORM_LIBS ?= -lpthread
 
 # Event loop implementation — kqueue for BSD/macOS/PS4/PS5, epoll for Linux
@@ -196,7 +199,11 @@ CFLAGS += -I./include/platform/ps5 -I./include/archive -I./include/runtime
 # LINKER FLAGS
 #============================================================================
 
-ifeq ($(HOST_OS),Linux)
+# Console payloads are loaded by loaders (GoldHEN binloader, elfldr) that
+# expect a position-independent executable, no matter which host built them.
+ifneq ($(filter $(TARGET),ps4 ps5),)
+    LDFLAGS += -pie
+else ifeq ($(HOST_OS),Linux)
     LDFLAGS += -pie
 endif
 LDFLAGS += $(PLATFORM_LDFLAGS)
@@ -216,6 +223,9 @@ SOURCES += src/platform/fileio/directory.c
 SOURCES += src/platform/pal_alloc.c
 SOURCES += src/platform/pal_scratch.c
 SOURCES += src/platform/pal_notification.c
+SOURCES += src/platform/pal_disc.c
+SOURCES += src/platform/pal_volume.c
+SOURCES += src/platform/pal_dns_filter.c
 SOURCES += src/platform/pal_filesystem.c
 SOURCES += src/platform/pal_filesystem_psx.c
 SOURCES += src/ftp/ftp_path.c
@@ -234,13 +244,22 @@ SOURCES += src/ftp/ftp_buffer_pool.c
 SOURCES += src/ftp/ftp_log.c
 SOURCES += src/ftp/ftp_crypto.c
 SOURCES += src/app/main.c
+SOURCES += src/app/instance_control.c
 SOURCES += src/platform/pal_resilient_server.c
 SOURCES += src/ftp/ftp_instance.c
 
-# PS5-specific modules
+# PS5 kernel syscall hook is opt-in until its firmware-specific install path
+# has been validated on real hardware. The normal payload never loads it.
+ENABLE_PS5_NET_FILTER ?= 0
 ifeq ($(TARGET),ps5)
+    CFLAGS += -DENABLE_PS5_NET_FILTER=$(ENABLE_PS5_NET_FILTER)
+endif
+ifeq ($(TARGET),ps5)
+SOURCES += src/platform/ps5/ps5_fw_offsets.c
+ifeq ($(ENABLE_PS5_NET_FILTER),1)
 SOURCES += src/platform/ps5/ps5_net_filter.c
 endif
+endif
 
 #============================================================================
 # ZHTTPD (Web File Explorer) — compile-time toggle
@@ -282,13 +301,27 @@ STRIP ?= strip
 ifeq ($(ENABLE_ZHTTPD),1)
     CFLAGS += -DENABLE_ZHTTPD=1
     CFLAGS += -DENABLE_WEB_UPLOAD=1
-    ENABLE_PKG_INSTALL ?= 0
+    # PKG installation rides along with the web interface; override with =0.
+    ENABLE_PKG_INSTALL ?= 1
     CFLAGS += -DENABLE_PKG_INSTALL=$(ENABLE_PKG_INSTALL)
+    ifeq ($(TARGET),ps5)
+        # The system installer cannot be driven from a payload process, so a
+        # small helper program is embedded here and delivered at runtime.
+        INSTALL_HELPER_ELF := $(BUILD_DIR)/install_helper.elf
+        INSTALL_HELPER_BLOB := $(BUILD_DIR)/generated/install_helper_blob.c
+        SOURCES += $(INSTALL_HELPER_BLOB)
+        SOURCES += src/http/games/ps5_install_helper.c
+        CFLAGS += -DZFTPD_INSTALL_HELPER=1
+    endif
     ENABLE_LIBCURL ?= 1
     SOURCES += $(EVENT_LOOP_SRC)
     SOURCES += src/http/http_server.c
+    SOURCES += src/http/http_listener.c
+    SOURCES += src/http/http_upload.c
     SOURCES += src/http/http_parser.c
     SOURCES += src/http/http_response.c
+    SOURCES += src/http/http_response_stream.c
+    SOURCES += src/http/http_json.c
     SOURCES += src/http/http_api.c
     SOURCES += src/http/http_api_common.c
     SOURCES += src/http/http_api_files.c
@@ -297,6 +330,7 @@ ifeq ($(ENABLE_ZHTTPD),1)
     SOURCES += src/http/http_api_transfer.c
     SOURCES += src/http/http_static.c
     SOURCES += src/http/http_api_archive.c
+    SOURCES += src/http/http_api_dump.c
     SOURCES += src/http/http_csrf.c
     WEB_RESOURCE_FILES := $(shell find web -path web/legacy -prune -o -type f -print | sort)
     HTTP_RESOURCES_C := $(BUILD_DIR)/generated/http/http_resources.c
@@ -304,7 +338,11 @@ ifeq ($(ENABLE_ZHTTPD),1)
     SOURCES += src/archive/exfat_unpacker.c
     SOURCES += src/archive/pkg_unpacker.c
     SOURCES += src/archive/builtin_unzip.c
+SOURCES += src/archive/zip_writer.c
+    SOURCES += src/archive/archive_path.c
     SOURCES += src/transfer/transfer_manager.c
+    SOURCES += src/transfer/transfer_state.c
+    SOURCES += src/transfer/dump_job.c
 endif
 
 # NFS URL transfers are enabled by default for PS5 zhttp builds. Other targets
@@ -362,41 +400,48 @@ endif
 # so we fall back to a simple file-existence check on bundled headers.
 #============================================================================
 
-# ── libarchive: auto-detect on desktop, opt-in on consoles ───────────────
+# ── libarchive: zhttp only; auto-detect on desktop ─────────────────────
 override ENABLE_LIBCURL ?= 0
-ifneq ($(filter $(TARGET),ps4 ps5),)
-  # PS4/PS5: no prebuilt static lib — explicit opt-in only (override ENABLE_LIBARCHIVE=1)
+ifeq ($(ENABLE_ZHTTPD),1)
+ifeq ($(TARGET),ps5)
+  # Optional PacBrew library for non-ZIP formats; ZIP keeps the builtin reader.
   override ENABLE_LIBARCHIVE ?= 0
   ifeq ($(ENABLE_LIBARCHIVE),1)
-    $(info [INFO] libarchive not supported on cross-compile targets — disabling)
-    override ENABLE_LIBARCHIVE := 0
+    PS5_PKG_CONFIG ?= $(PS5_PAYLOAD_SDK)/bin/prospero-pkg-config
+    _HAS_PS5_ARCHIVE := $(shell test -x $(PS5_PKG_CONFIG) && $(PS5_PKG_CONFIG) --exists libarchive && echo 1 || echo 0)
+    ifneq ($(_HAS_PS5_ARCHIVE),1)
+      $(error PS5 archive extraction requires PacBrew ps5-payload-libarchive)
+    endif
+    CFLAGS += -DENABLE_LIBARCHIVE=1 $(shell $(PS5_PKG_CONFIG) --cflags libarchive)
+    LIBS += $(shell $(PS5_PKG_CONFIG) --static --libs libarchive)
+    $(info [INFO] PS5 archive extraction: PacBrew libarchive)
   endif
+else ifeq ($(TARGET),ps4)
+  # PS4 builds use the builtin ZIP backend.
+  override ENABLE_LIBARCHIVE := 0
 else
   # Desktop (macOS/Linux): auto-detect unless user explicitly set it to 0
   ifneq ($(ENABLE_LIBARCHIVE),0)
     _HAS_ARCHIVE := 0
-    # 1) System headers
+    # 1) System installation
     _SYS_ARCHIVE := $(shell echo '\#include <archive.h>' | $(CC) -xc -fsyntax-only - 2>/dev/null && echo 1 || echo 0)
     ifeq ($(_SYS_ARCHIVE),1)
       _HAS_ARCHIVE := 1
-      $(info [INFO] libarchive: using system headers)
+      LIBS += -larchive
+      $(info [INFO] libarchive: using system installation)
     endif
-    # 2) macOS Homebrew (Apple Silicon, then Intel)
+    # 2) Homebrew keg (libarchive is keg-only on macOS)
     ifeq ($(_HAS_ARCHIVE),0)
       ifeq ($(HOST_OS),Darwin)
-        _HB_ARCHIVE := $(shell echo '\#include <archive.h>' | $(CC) -xc -fsyntax-only -I/opt/homebrew/include - 2>/dev/null && echo 1 || echo 0)
-        ifeq ($(_HB_ARCHIVE),1)
-          _HAS_ARCHIVE := 1
-          CFLAGS += -I/opt/homebrew/include
-          LDFLAGS += -L/opt/homebrew/lib
-          $(info [INFO] libarchive: using Homebrew (Apple Silicon) — /opt/homebrew)
-        else
-          _HB_ARCHIVE := $(shell echo '\#include <archive.h>' | $(CC) -xc -fsyntax-only -I/usr/local/include - 2>/dev/null && echo 1 || echo 0)
+        _BREW_ARCHIVE_PREFIX := $(shell brew --prefix libarchive 2>/dev/null)
+        ifneq ($(_BREW_ARCHIVE_PREFIX),)
+          _HB_ARCHIVE := $(shell echo '\#include <archive.h>' | $(CC) -xc -fsyntax-only -I$(_BREW_ARCHIVE_PREFIX)/include - 2>/dev/null && echo 1 || echo 0)
           ifeq ($(_HB_ARCHIVE),1)
             _HAS_ARCHIVE := 1
-            CFLAGS += -I/usr/local/include
-            LDFLAGS += -L/usr/local/lib
-            $(info [INFO] libarchive: using Homebrew (Intel) — /usr/local)
+            CFLAGS += -I$(_BREW_ARCHIVE_PREFIX)/include
+            LDFLAGS += -L$(_BREW_ARCHIVE_PREFIX)/lib
+            LIBS += -larchive
+            $(info [INFO] libarchive: using Homebrew keg $(_BREW_ARCHIVE_PREFIX))
           endif
         endif
       endif
@@ -425,6 +470,9 @@ else
     endif
   endif
 endif
+else
+  override ENABLE_LIBARCHIVE := 0
+endif
 
 # ── libcurl detection ─────────────────────────────────────────────────────
 # zftpd deliberately uses external libcurl instead of maintaining an HTTP/TLS
@@ -444,16 +492,67 @@ ifeq ($(ENABLE_LIBCURL),1)
     endif
     GENERATED_CA_HEADER := $(BUILD_DIR)/generated/zftpd_ca_bundle.h
     CFLAGS += -DZFTPD_EMBEDDED_CA_BUNDLE=1 -I$(BUILD_DIR)/generated
+    CURL_CA_BUNDLE_SRC := $(PS5_CA_BUNDLE)
     $(info [INFO] URL downloads: external PacBrew libcurl + embedded CA bundle)
   else ifeq ($(TARGET),ps4)
-    PS4_CURL_CONFIG ?= $(shell command -v orbis-curl-config 2>/dev/null || true)
-    ifeq ($(strip $(PS4_CURL_CONFIG)),)
+    # PacBrew ps4-openorbis portlibs (libcurl + mbedTLS + zlib) as unpacked by
+    # tools/fetch_pacbrew_ps4.sh.  Only the headers and the static libraries
+    # are used: the curl wrapper the package ships emits the OpenOrbis
+    # toolchain's own link flags, which do not belong in a payload-SDK link.
+    PS4_PACBREW_ROOT ?= $(shell for d in $(abspath external/pacbrew/ps4/openorbis) /opt/pacbrew/ps4/openorbis; do [ -f "$$d/usr/lib/libcurl.a" ] && { printf '%s' "$$d"; break; }; done)
+
+    ifneq ($(strip $(PS4_PACBREW_ROOT)),)
+      # The OpenOrbis build reaches errno through musl's __errno_location()
+      # and uses fnmatch()/execl(); the payload libc has none of them.
+      SOURCES += src/platform/ps4/ps4_pacbrew_compat.c
+      CFLAGS += -DENABLE_LIBCURL=1 -DCURL_STATICLIB -I$(PS4_PACBREW_ROOT)/usr/include
+      LIBS += -L$(PS4_PACBREW_ROOT)/usr/lib -lcurl -lmbedtls -lmbedx509 -lmbedcrypto -lz -lSceNet
+      # Same trust-store contract as PS5: HTTPS verification must not degrade
+      # silently, so the Mozilla bundle is embedded at build time.
+      PS4_CA_BUNDLE ?= $(PS4_PACBREW_ROOT)/usr/etc/ca-bundle.crt
+      ifeq ($(wildcard $(PS4_CA_BUNDLE)),)
+        $(error PS4 libcurl CA bundle not found: $(PS4_CA_BUNDLE) — re-run tools/fetch_pacbrew_ps4.sh or set PS4_CA_BUNDLE=<path>)
+      endif
+      GENERATED_CA_HEADER := $(BUILD_DIR)/generated/zftpd_ca_bundle.h
+      CFLAGS += -DZFTPD_EMBEDDED_CA_BUNDLE=1 -I$(BUILD_DIR)/generated
+      CURL_CA_BUNDLE_SRC := $(PS4_CA_BUNDLE)
+      $(info [INFO] URL downloads: PacBrew PS4 portlibs ($(PS4_PACBREW_ROOT)) + embedded CA bundle)
+    else
+    # A toolchain-provided pkg-config entry (or curl-config) still works.
+    # Probe the target environment only — a host libcurl would link code built
+    # for the wrong OS.
+    PS4_PKG_CONFIG ?= $(shell for c in $(PS4_PAYLOAD_SDK)/bin/orbis-pkg-config $(PS4_PAYLOAD_SDK)/bin/openorbis-pkg-config $(OPENORBIS)/bin/openorbis-pkg-config; do [ -x "$$c" ] && { printf '%s' "$$c"; break; }; done)
+    PS4_CURL_CONFIG ?= $(shell for c in $(PS4_PAYLOAD_SDK)/bin/orbis-curl-config $(PS4_PAYLOAD_SDK)/bin/curl-config $(PS4_PAYLOAD_SDK)/bin/openorbis-curl-config; do [ -x "$$c" ] && { printf '%s' "$$c"; break; }; done)
+
+    _HAS_PS4_CURL := $(shell if [ -n "$(strip $(PS4_PKG_CONFIG))" ] && $(PS4_PKG_CONFIG) --exists libcurl >/dev/null 2>&1; then echo 1; elif [ -n "$(strip $(PS4_CURL_CONFIG))" ]; then echo 1; fi)
+
+    ifneq ($(_HAS_PS4_CURL),1)
       $(info [INFO] PS4 external libcurl not found — URL downloader disabled)
+      $(info [INFO]   run tools/fetch_pacbrew_ps4.sh to install PacBrew ps4-openorbis-portlibs)
+      $(info [INFO]   or point PS4_PKG_CONFIG / PS4_CURL_CONFIG at a target config tool)
       override ENABLE_LIBCURL := 0
     else
-      CFLAGS += -DENABLE_LIBCURL=1 $(shell $(PS4_CURL_CONFIG) --cflags)
-      LIBS += $(shell $(PS4_CURL_CONFIG) --static-libs)
-      $(info [INFO] URL downloads: external PS4 libcurl)
+      ifneq ($(strip $(PS4_PKG_CONFIG)),)
+        PS4_CURL_CFLAGS := $(shell $(PS4_PKG_CONFIG) --cflags libcurl)
+        PS4_CURL_LIBS := $(shell $(PS4_PKG_CONFIG) --static --libs libcurl)
+      else
+        PS4_CURL_CFLAGS := $(shell $(PS4_CURL_CONFIG) --cflags)
+        PS4_CURL_LIBS := $(shell $(PS4_CURL_CONFIG) --static-libs)
+      endif
+      CFLAGS += -DENABLE_LIBCURL=1 $(PS4_CURL_CFLAGS)
+      LIBS += $(PS4_CURL_LIBS)
+
+      # Same trust-store contract as PS5: the PacBrew curl package ships the
+      # Mozilla bundle, and HTTPS verification must not degrade silently.
+      PS4_CA_BUNDLE ?= $(PS4_PAYLOAD_SDK)/target/user/homebrew/etc/ca-bundle.crt
+      ifeq ($(wildcard $(PS4_CA_BUNDLE)),)
+        $(error PS4 libcurl CA bundle not found: $(PS4_CA_BUNDLE) — override with PS4_CA_BUNDLE=<path>)
+      endif
+      GENERATED_CA_HEADER := $(BUILD_DIR)/generated/zftpd_ca_bundle.h
+      CFLAGS += -DZFTPD_EMBEDDED_CA_BUNDLE=1 -I$(BUILD_DIR)/generated
+      CURL_CA_BUNDLE_SRC := $(PS4_CA_BUNDLE)
+      $(info [INFO] URL downloads: PacBrew PS4 libcurl + embedded CA bundle)
+    endif
     endif
   else
     _HAS_CURL := $(shell echo '\#include <curl/curl.h>' | $(CC) -xc -fsyntax-only - 2>/dev/null && echo 1 || echo 0)
@@ -471,6 +570,44 @@ ifeq ($(ENABLE_LIBCURL),1)
   SOURCES += src/transfer/backend_curl.c
 endif
 
+# Native BitTorrent engine for magnet links. PS5 needs a libtorrent-rasterbar
+# port installed into its payload SDK; host libraries must never be linked
+# into a console payload.
+ENABLE_LIBTORRENT ?= 0
+ifeq ($(ENABLE_LIBTORRENT),1)
+  ifeq ($(TARGET),ps5)
+    PS5_PKG_CONFIG ?= $(PS5_PAYLOAD_SDK)/bin/prospero-pkg-config
+    ifneq ($(shell test -x $(PS5_PKG_CONFIG) && $(PS5_PKG_CONFIG) --exists libtorrent-rasterbar && echo 1),1)
+      $(error PS5 magnet downloads require a PS5 libtorrent-rasterbar port in the payload SDK)
+    endif
+    TORRENT_CFLAGS := $(shell $(PS5_PKG_CONFIG) --cflags libtorrent-rasterbar)
+    TORRENT_LIBS := $(shell $(PS5_PKG_CONFIG) --static --libs libtorrent-rasterbar)
+  else
+    ifneq ($(shell pkg-config --exists libtorrent-rasterbar 2>/dev/null && echo 1),1)
+      $(error ENABLE_LIBTORRENT=1 requires libtorrent-rasterbar development files)
+    endif
+    TORRENT_CFLAGS := $(shell pkg-config --cflags libtorrent-rasterbar)
+    TORRENT_LIBS := $(shell pkg-config --libs libtorrent-rasterbar)
+    ifeq ($(HOST_OS),Darwin)
+      TORRENT_BOOST_PREFIX := $(shell brew --prefix boost 2>/dev/null)
+      TORRENT_CFLAGS += -I$(TORRENT_BOOST_PREFIX)/include
+      TORRENT_OPENSSL_PREFIX := $(shell brew --prefix openssl@3 2>/dev/null)
+      TORRENT_CFLAGS += -I$(TORRENT_OPENSSL_PREFIX)/include
+    endif
+  endif
+  CFLAGS += -DENABLE_LIBTORRENT=1
+  TORRENT_CXXFLAGS := -std=c++17 -Wall -Wextra -Wpedantic -Werror -O2 -fPIE \
+    $(PLATFORM_DEFS) -I./include $(TORRENT_CFLAGS)
+  ifeq ($(TARGET),ps5)
+    TORRENT_CXXFLAGS += -fvisibility=hidden -fno-inline-functions
+  endif
+  LIBS += $(TORRENT_LIBS)
+  TORRENT_OBJECT := $(OBJ_DIR)/transfer/backend_torrent.o
+  CXX_LINK := $(CXX)
+else
+  CXX_LINK := $(CC)
+endif
+
 # ── libnfs detection ──────────────────────────────────────────────────────
 ifeq ($(ENABLE_LIBNFS),1)
   ifeq ($(TARGET),ps5)
@@ -496,6 +633,7 @@ endif
 OBJECTS := $(patsubst src/%.c,$(OBJ_DIR)/%.o,$(filter src/%.c,$(SOURCES)))
 OBJECTS += $(patsubst mcp/src/%.c,$(OBJ_DIR)/mcp/%.o,$(filter mcp/src/%.c,$(SOURCES)))
 OBJECTS += $(patsubst $(BUILD_DIR)/generated/%.c,$(OBJ_DIR)/generated/%.o,$(filter $(BUILD_DIR)/generated/%.c,$(SOURCES)))
+OBJECTS += $(TORRENT_OBJECT)
 
 # FFI Object files
 FFI_SOURCES := ffi/c_core/pal_ffi.c
@@ -612,7 +750,7 @@ $(PROJECT): all
 $(OUTPUT_ELF): $(OBJECTS) | $(BIN_DIR)
 	@echo "  [LD]  $@"
 	@mkdir -p $(BIN_DIR)
-	@$(CC) $(LDFLAGS) -o $@ $^ $(LIBS)
+	@$(CXX_LINK) $(LDFLAGS) -o $@ $^ $(LIBS)
 	@echo "Build complete: $(PROJECT) ($(TARGET), $(BUILD_TYPE))"
 
 # FFI Build Targets
@@ -638,7 +776,7 @@ endif
 $(FFI_OUTPUT): $(LIB_OBJECTS) $(FFI_OBJECTS) | $(BIN_DIR)
 	@echo "  [LD]  $@ (Shared Library)"
 	@mkdir -p $(BIN_DIR)
-	@$(CC) $(LDFLAGS) $(FFI_LDFLAGS) -fPIC -o $@ $(LIB_OBJECTS) $(FFI_OBJECTS) $(LIBS)
+	@$(CXX_LINK) $(LDFLAGS) $(FFI_LDFLAGS) -fPIC -o $@ $(LIB_OBJECTS) $(FFI_OBJECTS) $(LIBS)
 	@echo "FFI C-Core built: $@"
 
 # Build all supported platforms (best-effort: includes only toolchains found on the host).
@@ -735,18 +873,21 @@ debug-all:
 		echo "==> Building $$t (debug)"; \
 		$(MAKE) TARGET=$$t BUILD_TYPE=debug clean all; \
 	done
-# Generate the PS5 trust store from PacBrew's Mozilla CA bundle.
-ifeq ($(TARGET),ps5)
-ifeq ($(ENABLE_LIBCURL),1)
+# Generate the embedded trust store from PacBrew's Mozilla CA bundle (PS4/PS5).
+ifneq ($(strip $(CURL_CA_BUNDLE_SRC)),)
 $(OBJ_DIR)/transfer/backend_curl.o: $(GENERATED_CA_HEADER)
 
-$(GENERATED_CA_HEADER): $(PS5_CA_BUNDLE) tools/embed_binary.py
+$(GENERATED_CA_HEADER): $(CURL_CA_BUNDLE_SRC) tools/embed_binary.py
 	@echo "  [GEN] $@"
 	@python3 tools/embed_binary.py $< $@ zftpd_ca_bundle
 endif
-endif
 
 # Compile C source files
+$(OBJ_DIR)/transfer/backend_torrent.o: src/transfer/backend_torrent.cpp | $(OBJ_DIR) $(DEP_DIR)
+	@echo "  [CXX] $<"
+	@mkdir -p $(dir $@) $(dir $(DEP_DIR)/transfer/backend_torrent.d)
+	@$(CXX) $(TORRENT_CXXFLAGS) -MMD -MP -MF $(DEP_DIR)/transfer/backend_torrent.d -MT $@ -c $< -o $@
+
 $(OBJ_DIR)/%.o: src/%.c | $(OBJ_DIR) $(DEP_DIR)
 	@echo "  [CC]  $<"
 	@mkdir -p $(dir $@) $(dir $(DEP_DIR)/$*.d)
@@ -821,13 +962,31 @@ TEST_BINS += $(BUILD_DIR)/tests/test_copy_atomic
 TEST_BINS += $(BUILD_DIR)/tests/test_ftp_commands
 TEST_BINS += $(BUILD_DIR)/tests/test_fileio_tree
 TEST_BINS += $(BUILD_DIR)/tests/test_fileio_basic
+TEST_BINS += $(BUILD_DIR)/tests/test_ps5_fw_offsets
 ifeq ($(ENABLE_ZHTTPD),1)
 TEST_BINS += $(BUILD_DIR)/tests/test_transfer
+TEST_BINS += $(BUILD_DIR)/tests/test_transfer_parallel
+TEST_BINS += $(BUILD_DIR)/tests/test_transfer_state
+TEST_BINS += $(BUILD_DIR)/tests/test_transfer_queue
+TEST_BINS += $(BUILD_DIR)/tests/test_transfer_orphans
+ifeq ($(ENABLE_LIBTORRENT),1)
+TEST_BINS += $(BUILD_DIR)/tests/test_transfer_torrent
+endif
+TEST_BINS += $(BUILD_DIR)/tests/test_http_parser
+TEST_BINS += $(BUILD_DIR)/tests/test_http_upload
+TEST_BINS += $(BUILD_DIR)/tests/test_http_server
+TEST_BINS += $(BUILD_DIR)/tests/test_http_response_stream
 TEST_BINS += $(BUILD_DIR)/tests/test_http_api_common
 TEST_BINS += $(BUILD_DIR)/tests/test_http_files
 TEST_BINS += $(BUILD_DIR)/tests/test_http_process
 TEST_BINS += $(BUILD_DIR)/tests/test_http_system
 TEST_BINS += $(BUILD_DIR)/tests/test_http_games
+TEST_BINS += $(BUILD_DIR)/tests/test_archive_path
+TEST_BINS += $(BUILD_DIR)/tests/test_builtin_unzip
+TEST_BINS += $(BUILD_DIR)/tests/test_zip_writer
+TEST_BINS += $(BUILD_DIR)/tests/test_pal_volume
+TEST_BINS += $(BUILD_DIR)/tests/test_http_archive
+TEST_BINS += $(BUILD_DIR)/tests/test_dump_job
 endif
 
 ifeq ($(filter $(TARGET),linux macos),)
@@ -836,16 +995,20 @@ test: $(OUTPUT_BIN)
 else
 test: $(OUTPUT_ELF) $(TEST_BINS)
 	@echo "Running tests..."
-	@for t in $(TEST_BINS); do ./$$t; done
+	@set -e; for t in $(TEST_BINS); do ./$$t; done
 endif
 
 $(BUILD_DIR)/tests/test_http_query: tests/test_http_query.c $(LIB_OBJECTS) | $(BUILD_DIR)/tests
 	@echo "  [CC]  $<"
-	@$(CC) $(CFLAGS) -DFTP_AUTH_DELAY=0 -DFTP_PORT_ALLOW_FOREIGN_IP=1 -o $@ $< $(LIB_OBJECTS) $(LDFLAGS) $(LIBS)
+	@$(CXX_LINK) $(CFLAGS) -DFTP_AUTH_DELAY=0 -DFTP_PORT_ALLOW_FOREIGN_IP=1 -o $@ -x c $< -x none $(LIB_OBJECTS) $(LDFLAGS) $(LIBS)
+
+$(BUILD_DIR)/tests/test_transfer_torrent: tests/test_transfer_torrent.cpp $(TORRENT_OBJECT) | $(BUILD_DIR)/tests
+	@echo "  [CXX] $<"
+	@$(CXX) $(TORRENT_CXXFLAGS) -o $@ $< $(TORRENT_OBJECT) $(LDFLAGS) $(TORRENT_LIBS) -lpthread
 
 $(BUILD_DIR)/tests/%: tests/%.c $(LIB_OBJECTS) | $(BUILD_DIR)/tests
 	@echo "  [CC]  $<"
-	@$(CC) $(CFLAGS) -DFTP_AUTH_DELAY=0 -DFTP_PORT_ALLOW_FOREIGN_IP=1 -o $@ $< $(LIB_OBJECTS) $(LDFLAGS) $(LIBS)
+	@$(CXX_LINK) $(CFLAGS) -DFTP_AUTH_DELAY=0 -DFTP_PORT_ALLOW_FOREIGN_IP=1 -o $@ -x c $< -x none $(LIB_OBJECTS) $(LDFLAGS) $(LIBS)
 
 bin: $(OUTPUT_BIN)
 
@@ -972,3 +1135,44 @@ web-deploy:
 	@echo "  [WEB]  web-deploy is deprecated — web UI is now embedded in the binary"
 	@echo "  [WEB]  Resources are generated automatically under build/.../generated"
 	@echo "  [WEB]  Done — $(shell find web -path web/legacy -prune -o \( -name '*.css' -o -name '*.js' \) -print | wc -l | tr -d ' ') files deployed"
+
+#============================================================================
+# Flag changes must invalidate object files.
+#
+# Objects do not record the flags they were built with, so toggling a feature
+# (ENABLE_LIBTORRENT, ENABLE_PKG_INSTALL, ...) used to relink stale objects and
+# fail with undefined symbols.  The stamp is rewritten only when the flags
+# actually change, and every object depends on it, so a real change rebuilds.
+#============================================================================
+
+FLAG_STAMP := $(OBJ_DIR)/.build-flags
+
+.PHONY: FORCE
+FORCE:
+
+$(FLAG_STAMP): FORCE
+	@mkdir -p $(OBJ_DIR)
+	@printf '%s\n' '$(CFLAGS)' '$(LDFLAGS)' '$(LIBS)' > $@.tmp
+	@if ! cmp -s $@.tmp $@; then \
+		echo "  [FLAGS]    build flags changed — objects will be rebuilt"; \
+		mv -f $@.tmp $@; \
+	fi
+	@rm -f $@.tmp
+
+$(OBJECTS) $(LIB_OBJECTS): $(FLAG_STAMP)
+
+#============================================================================
+# PS5 installer helper
+#============================================================================
+
+ifneq ($(INSTALL_HELPER_ELF),)
+$(INSTALL_HELPER_ELF): src/platform/ps5/install_helper/install_helper.c | $(BIN_DIR)
+	@echo "  [CC]  $<"
+	@$(CXX_LINK) $(CFLAGS) -o $@ $< $(LDFLAGS) $(LIBS)
+
+$(INSTALL_HELPER_BLOB): $(INSTALL_HELPER_ELF) tools/gen_blob.py
+	@mkdir -p $(dir $@)
+	@python3 tools/gen_blob.py $< install_helper_elf $@
+
+$(OBJ_DIR)/generated/install_helper_blob.o: $(INSTALL_HELPER_BLOB)
+endif
diff --git a/README.md b/README.md
index f16b466..170ecec 100644
--- a/README.md
+++ b/README.md
@@ -213,7 +213,7 @@ To make these persistent, add them to `/etc/sysctl.conf`.
 - Launch after the system is fully booted and the loader is ready. The on-screen notification will display the IP and port.
 - For maximum throughput: direct cable from console to PC, static IPs, no router in between.
 - Avoid initiating transfers while background downloads or system updates are active — the network stack is shared.
-- If you see **"payload already loaded"**: a previous instance is still active. `zftpd` will attempt to terminate it and restart on the default port. If that fails, it tries up to 9 subsequent ports (`FTP_DEFAULT_PORT+1` … `+9`).
+- If you see **"payload already loaded"**: a previous instance is still active. The new payload asks it to shut down on its control port (`127.0.0.1:28888`) and the previous instance runs its own teardown even when its threads are blocked, so it always releases the FTP, HTTP and MCP ports. Instances that predate the control port — or one wedged after accepting it — are identified by thread name and stopped, never signalling the loader's process group. If a payload still holds the console, the new instance stops instead of binding ports another instance owns.
 
 </details>
 
@@ -301,7 +301,7 @@ Output artifacts are versioned and platform-tagged, placed in `build/<target>/<b
 | Compiler | C11 — `gcc` or `clang` |
 | Build system | `make` |
 | `.bin` generation | `objcopy` (binutils or llvm-objcopy); PS4: `orbis-objcopy`; PS5: `prospero-objcopy` |
-| PS4 | `PS4_PAYLOAD_SDK` set in environment |
+| PS4 | `PS4_PAYLOAD_SDK` set in environment; zhttp builds with downloads use the PacBrew PS4 portlibs, installed by `tools/fetch_pacbrew_ps4.sh` |
 | PS5 | `PS5_PAYLOAD_SDK` set in environment; zhttp builds require the PacBrew SDK bundle with libcurl + libnfs |
 
 ### Commands
@@ -323,12 +323,53 @@ make TARGET=linux test
 make TARGET=macos test
 ```
 
-### PS5 web downloads
+### Console web downloads
 
-PS5 zhttp builds use the maintained PacBrew ports of **libcurl** and **libnfs**.
-The downloader supports HTTP/HTTPS/FTP/FTPS and `nfs://` NAS sources; HTTPS
-certificate verification stays enabled and the PacBrew Mozilla CA bundle is
-embedded into the payload at build time. See [`docs/dependencies.md`](docs/dependencies.md).
+PS4 and PS5 zhttp builds use the maintained PacBrew ports of **libcurl**
+(PS5 also **libnfs**). The downloader supports HTTP/HTTPS/FTP/FTPS and
+`nfs://` NAS sources; HTTPS certificate verification stays enabled and the
+PacBrew Mozilla CA bundle is embedded into the payload at build time.
+See [`docs/dependencies.md`](docs/dependencies.md).
+
+PS5 zhttp releases also accept `magnet:?` links. They use a native
+libtorrent-rasterbar engine inside the payload; no companion computer is
+required. For local PS5 builds, install a PS5 SDK, then run
+`bash tools/build_ps5_libtorrent.sh "$PS5_PAYLOAD_SDK"` followed by
+`make TARGET=ps5 ENABLE_LIBTORRENT=1 clean all`. The release workflow builds this
+dependency automatically.
+
+PS5 extracts ZIP archives with its built-in reader. To enable other formats
+supported by libarchive, install PacBrew `ps5-payload-libarchive` in the PS5
+SDK and build with `make TARGET=ps5 ENABLE_LIBARCHIVE=1`. ZIP files continue
+to use the built-in reader in that build.
+
+PS4 builds detect the PacBrew package through the target toolchain only
+(`orbis-pkg-config` / `orbis-curl-config` inside `PS4_PAYLOAD_SDK`, or the
+`OPENORBIS` environment), never through the host's libcurl. When the package
+is missing the downloader is disabled at build time and the rest of zftpd is
+unaffected; the same behaviour is available explicitly with
+`ENABLE_LIBCURL=0`. Override `PS4_PKG_CONFIG`, `PS4_CURL_CONFIG` and
+`PS4_CA_BUNDLE` to point at a custom install.
+
+#### Download queue and resume
+
+Links pasted into the Transfers view line up in a FIFO queue: `TRANSFER_MAX_CONCURRENT`
+downloads run at a time (2 by default, override at build time with
+`-DTRANSFER_MAX_CONCURRENT=<n>`) and the rest wait, showing their position.
+Queued jobs can be held back or cancelled before they ever start; up to
+`TRANSFER_MAX_ACTIVE` (16) jobs are tracked.
+
+HTTP/FTP/NFS downloads write to `<name>.zftpd.part` and rename it after
+`fsync()`. Magnet downloads write a `<name>.zftpd.part` directory containing
+the torrent files; the directory is renamed after every piece is verified.
+Download status, destination and progress are recorded
+atomically in `/data/zftpd/transfers.state` (falling back to `/tmp/zftpd/`).
+BitTorrent resume data is stored alongside that state file. On startup zftpd
+restores the visible list and resumes unfinished jobs from the bytes already
+on disk. Paused jobs stay paused, and failed
+jobs remain visible for retry. The Transfers view can delete a saved partial
+and its record, or use Start over to delete it and start the same link from
+zero. Removing a completed record leaves the completed file untouched.
 
 ### Artifacts
 
@@ -401,6 +442,12 @@ After console Rest Mode, ZHTTP auto-reconnects via `/api/status` (see [docs/rest
 
 Custom console toasts are available via `GET /api/notify?text=Hello` (useful for Home Assistant and similar local automation — see [docs/API.md](docs/API.md)).
 
+The System view also drives the hardware: fan threshold, network-listener restart and **Blu-ray eject** (`POST /api/system/eject`, hidden on Digital Edition consoles). The eject path comes from [BD-EJ](https://github.com/seregonwar/BD-EJ).
+
+Downloads and previews send the raw file bytes. Console **SELF containers** can be requested decrypted instead, exactly like the FTP path does: enable *Settings → Downloads → Decrypt protected files* (or pass `?decrypt=1` to `/api/file/get`). The kernel pager is swapped in for that transfer only, so every other file — and every other client — keeps getting the on-disk bytes untouched.
+
+Selecting many items (folders included) offers **Download as ZIP**: the archive is built *while* it streams (`/api/archive/zip`), so nothing is written to the console and even multi-gigabyte selections need no free space.
+
 ---
 
 ## Acknowledgements
diff --git a/docs/dependencies.md b/docs/dependencies.md
index 8faa04d..8f3cc44 100644
--- a/docs/dependencies.md
+++ b/docs/dependencies.md
@@ -2,7 +2,38 @@
 
 zftpd keeps protocol implementations outside the project when a mature,
 maintained library already exists.  Console builds use the ports shipped by
-the PS5 PacBrew ecosystem rather than local compatibility shims.
+the PacBrew ecosystem rather than local compatibility shims.
+
+## PS4 zhttp transfer stack
+
+| Component | Purpose | Source |
+| --- | --- | --- |
+| libcurl 7.80.0 | HTTP, HTTPS, FTP and FTPS transfers | PacBrew `ps4-openorbis-libcurl` (static, links `-lSceNet`) |
+| mbedTLS 2.16.6 | TLS used by libcurl | PacBrew `ps4-openorbis-mbedtls` |
+| zlib 1.3.1 | libcurl transfer dependency | PacBrew `ps4-openorbis-zlib` |
+| Mozilla CA bundle | HTTPS trust store | downloaded by the fetch script and embedded at build time |
+
+`tools/fetch_pacbrew_ps4.sh` installs the pinned PacBrew packages into
+`external/pacbrew/ps4/openorbis` (versions and SHA-256 are pinned in the
+script, and the packages come from the public PacBrew repository).  No pacman
+and no OpenOrbis toolchain are needed: the payload keeps being built with
+`PS4_PAYLOAD_SDK`, and only the headers and the static libraries are used —
+the `curl-config` wrapper inside the package emits the OpenOrbis toolchain's
+own link flags (its linker script, `-nostdlib`, `-lSceLibcInternal`), which
+must not leak into a payload link.  The Makefile picks the prefix up
+automatically (`PS4_PACBREW_ROOT`, defaulting to the path above and to
+`/opt/pacbrew/ps4/openorbis`), and the release workflow installs the same set
+for the published PS4 artifacts.
+
+The OpenOrbis build of libcurl reaches `errno` through musl's
+`__errno_location()` and uses `fnmatch()`/`execl()`, none of which the payload
+libc exports; `src/platform/ps4/ps4_pacbrew_compat.c` bridges the three.
+
+With no prefix installed the URL downloader is simply disabled at build time.
+A toolchain-provided `orbis-pkg-config` / `orbis-curl-config` is still probed
+as a fallback, and `PS4_PKG_CONFIG`, `PS4_CURL_CONFIG` and `PS4_CA_BUNDLE`
+override the detection.  The build never falls back to the host's libcurl,
+which would link code built for the wrong OS.
 
 ## PS5 zhttp transfer stack
 
@@ -12,6 +43,8 @@ the PS5 PacBrew ecosystem rather than local compatibility shims.
 | OpenSSL | TLS used by libcurl | PacBrew dependency of `ps5-payload-curl` |
 | zlib / zstd / libpsl | libcurl transfer dependencies | PacBrew |
 | libnfs 5.0.3 | Userspace NFS client | `ps5-payload-dev/pacbrew-repo` (`ps5-payload-libnfs`) |
+| libtorrent-rasterbar 2.1.2 | Native BitTorrent magnet downloads | Cross-built from the pinned upstream source by `tools/build_ps5_libtorrent.sh` |
+| libarchive (optional) | Non-ZIP archive extraction with `ENABLE_LIBARCHIVE=1` | `ps5-payload-dev/pacbrew-repo` (`ps5-payload-libarchive`) |
 | Mozilla CA bundle | HTTPS trust store | generated by the PacBrew curl package and embedded at build time |
 
 The release workflow pins PacBrew `v0.40.2` and verifies the published
@@ -26,10 +59,26 @@ Backends are selected by URL scheme:
 
 - `http://`, `https://`, `ftp://`, `ftps://` -> libcurl
 - `nfs://` -> libnfs
+- `magnet:?` -> libtorrent-rasterbar in PS5 builds with `ENABLE_LIBTORRENT=1`
 
-Downloads are written to `<name>.zftpd.part`, support resume where the remote
-protocol permits it, and are atomically renamed to the final filename only
-after the transfer and `fsync()` succeed.
+HTTP/FTP/NFS downloads are written to `<name>.zftpd.part`, support resume
+where the remote protocol permits it, and are renamed after the transfer and
+`fsync()` succeed. Magnet downloads use a partial directory with the same
+suffix and store resume data in `/data/zftpd` (or `/tmp/zftpd` fallback).
+The directory becomes visible under its final name only after libtorrent
+verifies all pieces.
+
+For new HTTP/HTTPS downloads of at least 128 MiB, libcurl first checks byte-range
+support and a strong ETag, then measures one 32 MiB range. If that connection
+is below 16 MB/s, four range requests run concurrently in 8 MiB chunks. Each
+wave is verified and appended in order, so the partial file stays contiguous
+and can still resume after interruption. An existing partial file can also use
+four connections: before fetching its suffix, zftpd compares small regions at
+the start, middle and end of the local prefix with the current remote file.
+A mismatch stops the download without changing the partial file. This sampling
+does not prove every byte of a legacy partial matches; new suffix ranges are
+checked against the same strong ETag. Servers without range support or a strong
+ETag continue with one connection.
 
 NFS URLs use libnfs syntax, for example:
 
diff --git a/external/read.txt b/external/read.txt
index 084c2a3..fc310c5 100644
--- a/external/read.txt
+++ b/external/read.txt
@@ -1 +1,2 @@
-put here ps4-payload-sdk, ps5-payload-sdk 
\ No newline at end of file
+put here ps4-payload-sdk, ps5-payload-sdk
+(pacbrew PS4 portlibs are installed by tools/fetch_pacbrew_ps4.sh into pacbrew/)
diff --git a/src/platform/ps4/ps4_pacbrew_compat.c b/src/platform/ps4/ps4_pacbrew_compat.c
new file mode 100644
index 0000000..0fb8061
--- /dev/null
+++ b/src/platform/ps4/ps4_pacbrew_compat.c
@@ -0,0 +1,94 @@
+/*
+ * MIT License — Copyright (c) 2026 SeregonWar
+ * See LICENSE for full text.
+ */
+
+/**
+ * @file ps4_pacbrew_compat.c
+ * @brief libc glue for the PacBrew ps4-openorbis libcurl
+ *
+ * The PacBrew port of libcurl is built against the OpenOrbis musl libc while
+ * the payload itself links against the ps4-payload-sdk.  Three symbols the
+ * OpenOrbis build expects do not exist in the payload runtime:
+ *
+ *   __errno_location()  musl reaches errno through this accessor; the payload
+ *                       libc exports __error() instead (see <errno.h>).
+ *   fnmatch()           curl uses it for file:// wildcards.
+ *   execl()             curl uses it to delegate NTLM authentication.
+ *
+ * zftpd's downloader reaches neither of the two functions, so they are
+ * implemented with plain behavior rather than left to break the link.
+ *
+ * The file is compiled only for PS4 builds with ENABLE_LIBCURL=1.
+ */
+
+#include <errno.h>
+#include <fnmatch.h>
+#include <stddef.h>
+#include <unistd.h>
+
+int *__errno_location(void);
+int *__errno_location(void) {
+  return __error();
+}
+
+int fnmatch(const char *pattern, const char *string, int flags);
+int fnmatch(const char *pattern, const char *string, int flags) {
+  (void)flags;
+  while (*pattern != '\0') {
+    if (*pattern == '*') {
+      while (*pattern == '*') pattern++;
+      if (*pattern == '\0') return 0;
+      while (*string != '\0') {
+        if (fnmatch(pattern, string, 0) == 0) return 0;
+        string++;
+      }
+      return FNM_NOMATCH;
+    }
+    if (*string == '\0') return FNM_NOMATCH;
+    if (*pattern == '?') {
+      pattern++;
+      string++;
+      continue;
+    }
+    if (*pattern == '[') {
+      const char *set = pattern + 1;
+      int negate = (*set == '!' || *set == '^');
+      int matched = 0;
+      int first = 1;
+      char previous = '\0';
+      if (negate) set++;
+      while (*set != '\0' && (*set != ']' || first)) {
+        first = 0;
+        if (*set == '-' && previous != '\0' && set[1] != '\0' && set[1] != ']') {
+          if ((unsigned char)previous <= (unsigned char)*string &&
+              (unsigned char)*string <= (unsigned char)set[1])
+            matched = 1;
+          set += 2;
+          previous = '\0';
+          continue;
+        }
+        if (*set == *string) matched = 1;
+        previous = *set;
+        set++;
+      }
+      if (*set != ']' || matched == negate) return FNM_NOMATCH;
+      pattern = set + 1;
+      string++;
+      continue;
+    }
+    if (*pattern == '\\' && pattern[1] != '\0') pattern++;
+    if (*pattern != *string) return FNM_NOMATCH;
+    pattern++;
+    string++;
+  }
+  return (*string == '\0') ? 0 : FNM_NOMATCH;
+}
+
+int execl(const char *path, const char *arg, ...);
+int execl(const char *path, const char *arg, ...) {
+  (void)path;
+  (void)arg;
+  errno = ENOSYS;
+  return -1;
+}
diff --git a/tools/fetch_pacbrew_ps4.sh b/tools/fetch_pacbrew_ps4.sh
new file mode 100755
index 0000000..abf5dd1
--- /dev/null
+++ b/tools/fetch_pacbrew_ps4.sh
@@ -0,0 +1,96 @@
+#!/usr/bin/env bash
+# Fetch the PacBrew PS4 port libraries that back the URL downloader.
+#
+# PacBrew ships ps4-openorbis-libcurl (static, mbedTLS, links -lSceNet) and its
+# dependencies as pacman packages.  This script unpacks the pinned set into a
+# plain prefix — no pacman and no OpenOrbis toolchain are needed, because the
+# payload keeps being built with PS4_PAYLOAD_SDK: only the headers and the
+# static libraries are used.  (The curl-config wrapper inside the package emits
+# OpenOrbis-only link flags such as its own linker script and -nostdlib, which
+# must not leak into a payload link.)
+#
+# The Makefile detects the prefix automatically (PS4_PACBREW_ROOT), so after
+# running this script `make TARGET=ps4 ENABLE_ZHTTPD=1` builds with the URL
+# downloader enabled and the CA bundle embedded.
+#
+# Usage: tools/fetch_pacbrew_ps4.sh [PREFIX]
+#   PREFIX  extraction root (default: external/pacbrew/ps4/openorbis)
+#
+# Environment:
+#   PACBREW_PS4_REPO     package server (default: the public PacBrew repo)
+#   PS4_CA_BUNDLE_FILE   reuse an existing Mozilla CA bundle instead of
+#                        downloading one from curl.se
+set -euo pipefail
+
+script_dir="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd -P)"
+prefix="${1:-$script_dir/../external/pacbrew/ps4/openorbis}"
+prefix="${prefix%/}"
+repo="${PACBREW_PS4_REPO:-https://pacman.mydedibox.fr/pacbrew/packages}"
+ca_file="${PS4_CA_BUNDLE_FILE:-}"
+cache="$(dirname "$prefix")/.downloads"
+
+# name sha256 — pinned like the PS5 PacBrew bundle in the release workflow.
+packages=(
+  "ps4-openorbis-zlib-1.3.1-2-any.pkg.tar.xz 2b082d25f34d923e2fd35e0b5f29b19e142e263da4380665bb0e80f0a6378700"
+  "ps4-openorbis-mbedtls-2.16.6-3-any.pkg.tar.xz 7fe7ad512c2ccf7b53865433753b9ddcaf6385eed36b8160d93134fa64f0dc58"
+  "ps4-openorbis-libcurl-7.80.0-3-any.pkg.tar.xz 249c987a8e41e1b7d320cd3129aa1752416dc19e830714d5a38be6c977f5db98"
+)
+
+sha_of() {
+  if command -v sha256sum >/dev/null 2>&1; then
+    sha256sum "$1" | awk '{print $1}'
+  else
+    shasum -a 256 "$1" | awk '{print $1}'
+  fi
+}
+
+mkdir -p "$cache" "$prefix"
+prefix="$(cd "$prefix" && pwd -P)"
+work="$(mktemp -d "${TMPDIR:-/tmp}/zftpd-pacbrew-ps4.XXXXXXXX")"
+trap 'rm -rf "$work"' EXIT
+
+for entry in "${packages[@]}"; do
+  file="${entry%% *}"
+  want="${entry##* }"
+  archive="$cache/$file"
+  if [[ ! -f "$archive" ]] || [[ "$(sha_of "$archive")" != "$want" ]]; then
+    echo "downloading $file"
+    curl -fL --retry 3 -o "$archive.tmp" "$repo/$file"
+    mv "$archive.tmp" "$archive"
+  fi
+  if [[ "$(sha_of "$archive")" != "$want" ]]; then
+    echo "error: checksum mismatch for $archive" >&2
+    exit 1
+  fi
+  tar -xJf "$archive" -C "$work"
+done
+
+# The packages carry the upstream /opt/pacbrew/ps4/openorbis layout; flatten
+# it into the prefix so the include/ and lib/ trees can be used directly.
+if [[ -d "$work/opt/pacbrew/ps4/openorbis" ]]; then
+  cp -R "$work/opt/pacbrew/ps4/openorbis/." "$prefix/"
+fi
+test -f "$prefix/usr/lib/libcurl.a"
+test -f "$prefix/usr/lib/libmbedtls.a"
+test -f "$prefix/usr/lib/libz.a"
+
+# HTTPS verification must not degrade silently: keep a Mozilla bundle next to
+# the libraries, where the Makefile looks for it (embedded into the payload).
+bundle="$prefix/usr/etc/ca-bundle.crt"
+if [[ -n "$ca_file" ]]; then
+  mkdir -p "$(dirname "$bundle")"
+  cp "$ca_file" "$bundle"
+fi
+if [[ ! -s "$bundle" ]]; then
+  mkdir -p "$(dirname "$bundle")"
+  echo "downloading Mozilla CA bundle"
+  curl -fL --retry 3 -o "$bundle.tmp" https://curl.se/ca/cacert.pem
+  mv "$bundle.tmp" "$bundle"
+fi
+grep -q -- "-----BEGIN CERTIFICATE-----" "$bundle"
+
+echo
+echo "PacBrew PS4 portlibs installed in $prefix"
+echo "  PS4_PACBREW_ROOT=$prefix"
+echo "  PS4_CA_BUNDLE=$bundle"
+echo "make TARGET=ps4 ENABLE_ZHTTPD=1 now builds with the URL downloader enabled"