FP3 custom rom development based on released source code

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Yiha! I have lineage on the FP3! (with gsi)

I used the treble_arm64_bvN image.

  1. Install magisk
    Note the slote !

  2. Flash back stock vendor & system, erase userdata

    fastboot getvar current-slot
    fastboot --set-active={slot with magisk} # if needed
    fastboot flash vendor vendor.img # Not sure if needed
    fastboot flash system system.img # Not sure if needed
    fastboot -w

  3. Flash the gsi on the two slots!

    fastboot flash system_a {gsi_image}
    fastboot flash system_b {gsi_image}

  4. Reboot and wait

    fastboot reboot

Note: Can someone try directly from step 3? or only with fastboot -w boot needs to be changed.
Note2: The slots need to have success

fastboot getvar all
[...]
(bootloader) current-slot:a
(bootloader) slot-retry-count:b:6
(bootloader) slot-success:b:Yes
(bootloader) slot-active:b:No
(bootloader) slot-unbootable:b:No
(bootloader) slot-retry-count:a:6
(bootloader) slot-success:a:Yes
(bootloader) slot-active:a:Yes
(bootloader) slot-unbootable:a:No

To get a slot-success=Yes, you have to do : (with stock system)

bootloader --set-active=a
bootloader reboot (go until system)
bootloader --set-active=b
bootloader reboot

Note3 :
To get the navigation bar, as mentionned by @dyd0u,

Maybe we could change it directly in the boot props.

Note4:
Some unwanted packages are still there (because of the way treble works). It is easy to disable/uninstall them.

adb shell pm disable-user --user 0 com.qualcomm.qti.qms.service.telemetry
adb shell pm disable-user --user 0 com.qualcomm.qti.qms.service.connectionsecurity
adb shell pm disable-user --user 0 com.qualcomm.qti.optinoverlay
adb shell pm disable-user --user 0 com.orange.update
adb shell pm disable-user --user 0 com.orange.aura.oobe
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