Download twrp from here
Download LineageOS 17 from here
Boot phone to boot menu then fastboot twrp
sudo fastboot boot Downloads/twrp-3.3.0-0-sailfish.img
Wipe to factory defaults
Side load LineageOS Android 10 from the Advanced page on TWRP
adb sideload Downloads/lineage-17.0-withMTG-20191217-UNOFFICIAL-sailfish.zip
Reboot and setup.
Command from here
https://android.stackexchange.com/a/78183/239063
From a command line run
( printf "\x1f\x8b\x08\x00\x00\x00\x00\x00" ; tail -c +25 ~/Path/to/android_backup.ab ) | tar xfvz -
https://stackoverflow.com/questions/18533567/how-to-extract-or-unpack-an-ab-file-android-backup-file
Install Android Backup Toolkit
wget https://downloads.sourceforge.net/project/adbextractor/android-backup-tookit-20180521.zip unzip android-backup-tookit-20180521.zip cd android-backup-tookit/android-backup-extractor/android-backup-extractor-20180521-bin
Unpack backup. Changes it from an ab to a tar file
java -jar abe.jar unpack ~/path/to/backup.ab ~/path/to/backup.tar
After thats complete, you can untar it. Change Desktop to the path you want to extract to.
tar -xvf ~/path/to/backup.tar -C ~/Desktop/
The LineageOS Updater downloads updates fine, but crashes as soon as you hit Install.
Looks like there may be a bug that has something to do with an update that it already downloaded and installed, but waiting on the device to reboot.
Reboot the device to resolve the issue.
Other things to try would include deleting and redownloading the update and/or trying a different update.
Install adb
sudo apt-get -y install adb
Backup with adb
adb backup -apk -obb -shared -all -f ~/Desktop/AndroidBackup.ab
Unlock your phone, authorize usb debugging, and hit “Back up my data”
You may need to enable USB debugging in the developer options in the settings.
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
Install SDK
Install Android Studio. This will install the SDK and tools like adb and fastboot
Download from here
To run adb, you’ll need to be in the same directory as it, so open a Command Prompt and cd to the following directory.
cd %APPDATA%..\Local\Android\Sdk\platform-tools
Full directory path is
C:\Users\UserName\AppData\Local\Android\Sdk\platform-tools
Backup Android
On your Android device you will need to enable USB debugging from the developer options. Enable the developer options if you have not already.
When you plug your phone in it should ask you to Allow USB debugging. Hit OK to enable it.
Now run the backup command from your computer. Replace UserName with your computers User Name
adb backup -apk -obb -shared -all -f \Users\UserName\Desktop\android-backup.ab
On your phone you should get a window that shows Full Backup
Add optional password for backup and hit “Back up my data on phone”
Now Wait for it to finish…
Restore Backup
adb restore C:\Users\UserName\android-backup.ab
Should get a restore window on your phone, hit restore and wait.
Errors
error: device unauthorized.
This adb server's $ADB_VENDOR_KEYS is not set
Try 'adb kill-server' if that seems wrong.
Otherwise check for a confirmation dialog on your device.
USB Debugging is not allowed for computer. Try replugging the USB cable and accepting the USB Debugging.
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 from LineageOS
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