Enable developer options By going to
Settings > System > About Phone > Developer options (Tap 7 times)
Enable OEM unlock in Developer settings
Reboot into recovery
If your one Verizon you may need to go through a couple extra steps to get the oem unlock to show up in the developer settings. More info here
Boot into twrp
fastboot img twrp.iso
Select the option in TWRP to sideload and sideload the Lineage iso
adb sideload lineage
Reboot install GAPPS
adb sideload gapps.zip
Just some notes on trying to install LineageOS on Google Pixel.
Basic install steps
Lineage 15 Official
Install guide is here. Here are some extra notes.
Google Recovery Images (Helpful if you didn’t create a backup…) https://developers.google.com/android/images
LineageOS Download link
https://download.lineageos.org/sailfish
Lineage OS 16 Unofficial
Helpful Links
https://forum.xda-developers.com/pixel-xl/development/rom-lineage-16-0-pixels-sailfish-marlin-t3830083
https://forum.xda-developers.com/showpost.php?p=78350286&postcount=579
Other Notes
ADB and fastboot should be in the following directory. May need to install them if they are not.
cd %userprofile%\appdata\local\Android\Sdk\platform-tools
Boot TWRP image using fastboot. Run from the bootloader menu, should automatically load.
fastboot boot twrp.img
Seems like there can be some issues with the Pixel and it swapping A/B on boot. You can use TWRP to reboot into A or B, or set it with fastboot
fastboot --set-active=b
Apparently a/b devices will show up as no os installed in TWRP
TWRP says no OS installed, system boot loops
byu/jhsbane inLineageOS
Backup and restore
You can use adb to create a backup of your phone. Not sure what all it backs up. Once restored pictures, background, and other files seem to be there.
Backup with
adb backup -apk -shared -all -f \Path\to\folder\backup_name.ab
Restore backup with
adb restore \Path\to\folder\backup_name.ab