Official LineageOS 19 for Fairphone 3/3+

Participate Development
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123

Thank you, you pointed me to the right direction. Now it works.

For the record, here is what I did:

  1. OEM unlock. For me, this way was simple and worked.

  2. Boot to fastboot (aka bootloader) mode

  3. Boot to TWRP recovery with the following command: fastboot boot "C:\whatever\twrp-3.6.2_9-0-FP3.img"

  4. On TWRP recovery, install TWRP (Advanced > Flash Current TWRP).

  5. Format data, wipe data etc.

  6. Sideload LineageOS: adb sideload "C:\whatever\lineage-19.1-20220829-nightly-FP3-signed.zip". In the displayed logs, note the slot on which it is installed (A or B).

  7. Still on TWRP, go to Reboot, tap on the slot noted above, and then boot to Recovery.

  8. LOS’s recovery boots (why did LOS’s recovery overwrite TWRP? Too bad IMO), sideload NikGapps-core-arm64-12.1-20220830-signed.zip.Upon warning Signature verification failed. Install anyway? answer Yes (IIRC, on TWRP there would have been no such warning).

  9. Reboot to system. Check that everything works.

  10. (optional) Reboot to (LOS’s) recovery and sideload Magisk-v25.2.zip. If warned that there’s a signature problem, tell it to keep on.

  11. Reboot to system

  12. (Todo) Reinstall TWRP