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Catcrafts builds of the postmarketos image for the fairphone 6
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Jorijn van der Graaf 60a29c2590
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Details
imsd 0.3.3-r0: landline callers ring 
Pin the registry's imsd 0.3.3-r0. The media leg plays AMR narrowband and
G.711 as well as AMR-WB, so calls from landlines and other narrowband
gateways ring instead of being refused with 488; a refused INVITE no longer
flashes the dialer; the offer lists AMR-NB after AMR-WB; CODECS=<list>
overrides the codec set for bench work. 0.3.3 over 0.3.2: the media leg
resolves the audio user once and thread-safely — a getpwnam race between
the mic and playout threads could start both PipeWire helpers in
/run/user/0 and answer a call into static.

Verified on the dev phone 2026-09-08 with the registry apks: 0.3.2 exposed
the race on an incoming call (found by this very check), 0.3.3 carries the
fix; the code path had sixteen bench calls that evening (PCMA and AMR-NB in
both directions, default AMR-WB unchanged).
2026-09-08 20:24:07 +02:00
.forgejo/workflows Install fingerprintd from the registry, so the image unlocks with a finger 2026-09-05 20:31:37 +02:00
aports fp6-vendor-blobs: the checksum the extractor change forgot, and a check that finds the next one in a second 2026-09-05 22:26:33 +02:00
.gitignore gitignore dist/; fix empty then-branch (sh syntax) in the NV verdict 2026-08-09 02:44:39 +02:00
apk-resign.py imsd: sign from a readable copy of the abuild key 2026-09-02 17:21:30 +02:00
build.sh imsd 0.3.3-r0: landline callers ring 2026-09-08 20:24:07 +02:00
check-aports.sh fp6-vendor-blobs: the checksum the extractor change forgot, and a check that finds the next one in a second 2026-09-05 22:26:33 +02:00
install.sh debian fix 2026-08-29 00:40:38 +02:00
README.md Update README.md 2026-09-06 14:00:13 +00:00

README.md

fp6-img

Flashable postmarketOS images for the Fairphone 6/6+, built nightly from the Catcrafts milos-linux combined-stable kernel branch, with imsd (userspace VoLTE) preinstalled.

Maintained by Jorijn van der Graaf (TheMightyCat) at Catcrafts.

What works

Everything on the combined-stable branch: display, touch, wifi, cellular data, NFC (reader), speaker audio, microphone, IMU, magnetometer, barometer, ambient light/proximity, fingerprint unlock through fingerprintd, plus VoLTE calls (both directions) through imsd.

Flashing

Download fp6-img.tar.xz from the latest release and unlock the bootloader (Fairphone's official process).

Install: with the phone in fastboot mode,

tar xf fp6-img.tar.xz
cd fp6-img
./install.sh

install.sh erases dtbo, flashes the rootfs, RAM-boots the kernel, writes the boot partition from inside Linux where the bootloader's NV-wipe cannot see it, then reads the modem NV back and reports the result. The bootloader never writes boot.

Default login: user / 147147 (same as official postmarketOS images). Never re-lock the bootloader with a custom image installed.

VoLTE configuration

imsd is installed but needs your carrier's P-CSCF address:

# /etc/imsd.env
PCSCF=<your carrier's P-CSCF IPv6 address>

Find it via android adb using adb shell dumpsys telephony.registry, then systemctl restart imsd (the service is enabled at boot and waits for this file to exist). See the imsd README for the full variable reference and carrier assumptions.