Thanks for your efforts! I got my FP3 two a week ago and now successfully installed your LineageOS ROM. Perhaps it might help others, below is roughly what I did. Although there are better guides here and there, this puts it all in one place. So perhaps useful for others here. Use at your own risk.
Installation guide for LineageOS on the FP3 from a stock ROM. Prerequisites: a computer with adb and fastboot installed.
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Get your access code here: https://www.fairphone.com/en/bootloader-unlocking-code-for-fairphone-3/
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As per https://support.fairphone.com/hc/en-us/articles/360041655711-Unlock-the-bootloader-of-your-Fairphone-3:
2a. Enable OEM unlocking
2b. Reboot into bootloader: “adb reboot-bootloader
” (or power + volume down when devices is off)
2d. Run “fastboot oem unlock <your unlock code>
” after the device is in the menu
2e. Follow the instructions on the device - all data will be wiped so make sure you have your data safe -
Download the .img version of TWRP (3.4.0 or newer) from
https://eu.dl.twrp.me/FP3/
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Download the latest LineageOS ROM for FP3 from
https://github.com/WeAreFairphone/android_device_fairphone_FP3/releases
(choose between with and without MicroG) -
As per this thread:
5a. Reboot into bootloader: “adb reboot-bootloader
” (or power + volume down when devices is off)
5b. Reboot into TWRP (not installing it, just booting into): “fastboot boot twrp-3.4.0-0-FP3.img
”
5c. Inside TWRP: Swipe to allow modifications first
5d. Enable sideloading: Advanced -> ADB Sideload -> Swipe
5e. Then from your computer, run: “adb sideload lineage-16.0-20200625-UNOFFICIAL-FP3-with-microG.zip
” (or other .zip)
5f. Select back (don’t reboot yet) and select Wipe -> Format Data -> yes
5g. Now “Reboot System” and LineageOS should show up -
After boot into LineageOS, in case of MicroG and GCM:
6a. Do the MicroG self-check and make sure everything is ticked
6b. Enable ‘Google device registration’ and ‘Google Cloud Messaging’ in MicroG settings
6c. Dial the phone ‘number’:*#*#2432546#*#*
(for GCM - make sure it says it is connected)
6d. Only then install apps (through F-Droid or Aurora Store)