The installer deletes /usr/data/anvil outright and extracts into the empty directory. The installed set is the shipped set by construction, so a renamed file cannot survive beside its replacement and no list has to be shipped, read or trusted for that to hold. What that costs is everything else under $MODDIR, and the audit of what was actually there is docs/notes/86-wipe-and-extract.md. backup/stock had no restore path in any script and omitted the one file a restore would need. .prev-root-hash was already dead state. config-installed was a twelve-file snapshot serving one md5, for a compare whose stated rationale -- "there is no include-and-override seam" -- stopped being true when moonraker-custom.conf became the last include, and which inverted its own purpose by keeping the webcam block and the API lockdown off any printer that tripped it. So moonraker.conf is overwritten like every ff-*.cfg. HelixScreen's /tmp stash is untouched and is now the only preservation the installer does, so the gate asserts it with a value that could only have come from the printer. Gone with it: both delete passes, the forged-path guard, the rmdir pass, the pre-manifest branch, the unconditional init.d/anvil-service/ anvil.conf removal, the etc/s6 scandir sweep and the $MODDIR __pycache__ sweep -- the last two existed only because a manifest cannot see paths made at runtime. firmwareExe already makes the scandir itself. test_upgrade.py rewritten: the negative control is inverted rather than deleted, and the legacy fixture goes -- there is one path now. qa/static green (112). The replica lane needs a package in work/out, which needs config.env with FF_KEY and STOCK_TGZ; not run here. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01KXKk3zz8LAUPUDZkVEZ9fR
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Upgrading, and your files
A newer release installs exactly like the first flash: stick in, power on. Nothing you have set is asked for again. This page is the line between the files that are yours and the files the mod overwrites without asking, because that line is what makes an update safe.
Your files and the mod's files
| File | Whose |
|---|---|
/usr/data/config/printer.cfg |
Yours — never overwritten. Overrides go here, after the includes: restate only what you change, the last value wins. |
moonraker-custom.conf |
Yours — created once, never rewritten, included last so your settings win. Do not delete it. |
ff-*.cfg, printer.base.cfg, moonraker.conf |
The mod's — overwritten on every update; do not edit. |
anvil/helixscreen/config/settings.json |
Yours — everything you set on the screen. Written by HelixScreen itself; carried across updates along with helixscreen.env and its spool map. |
Upgrading
A newer release installs exactly like the first flash: stick in, power on.
Your printer.cfg with its saved calibration, moonraker-custom.conf, your
root password and everything you set on the screen survive; the ff-*.cfg
family is replaced. If a release changes helixscreen.env, yours is kept and
the new one is left beside it as helixscreen.env.mod-new.
The config files in detail
The .cfg includes are wired up for you: printer.base.cfg ends with
the seven [include ff-*.cfg] lines, so a flash brings the mod up by itself.
Your printer.cfg is not touched. The factory dock and nozzle numbers are
pulled in for you too: on the first boot after the flash, [ff_legacy] imports
firmwareExe's per-unit JSON and persists it with its own SAVE_CONFIG, so
Klipper restarts once, right after coming up — before the screen is on its
feet. TOOL_OFFSET_STATUS afterwards should show a nozzle triple for every
tool and no NOT CALIBRATED.
The included files are the mod's, and every update overwrites them without
asking — ff-*.cfg and printer.base.cfg alike. Do not edit them. Put changes
at the end of printer.cfg, restating only the option or macro you are
changing: Klipper merges same-named sections and the last value wins, so
everything you leave out keeps the shipped value and your overrides survive
every flash. Each of those files opens with a header saying as much.
moonraker.conf is mod-owned too — it is overwritten on every update, which
is how the [webcam] block and the API lockdown reach the printer. Its seam is
moonraker-custom.conf beside it: created once, never written again, and
included at the end of moonraker.conf, so anything you set there wins.
Do not delete it — Moonraker treats an include that matches no file as fatal
and will refuse to start. An empty one is fine.
Editing moonraker.conf itself does not survive: the next update overwrites
it, and that is how the [webcam] block and the API lockdown reach your
printer. Put the change in moonraker-custom.conf instead.
A FlashForge OTA update is a different thing
Everything the mod installs is under /usr/data/anvil on the data partition,
the klippy tree and its extras included, so an OTA cannot delete them. What it
does rewrite is /usr/prog, and with it the firmwareExe the mod boots
from — so re-flash the mod after a firmware update. The #*# block in
printer.cfg survives either way.
Going back to stock
Flashing the stock FlashForge package for your model is the uninstall — it installs the same way, and it restores every file the mod touches. The one thing it cannot bring back is FlashForge's Moonraker, which the stock package does not carry: the mod's build stays, it works, and Mainsail is happy with it. The details, and the ladder below it, are in Support.