Upgrade LineageOS on
Google Pixel 3a XL

Basic requirements

1. Read through the instructions at least once before actually following them, so as to avoid any problems due to any missed steps!
2. You actually want to upgrade your device to the newest version - if you wish to downgrade to an earlier version of LineageOS, follow your device’s instructions for installing LineageOS the first time.
3. You are aware of this device’s known quirks

Manually upgrading LineageOS

The updater app does not support upgrades from one version of LineageOS to another, and will block installation to any update for a different version. Upgrading manually requires similar steps to installing LineageOS for the first time.

1. Download the LineageOS install package that you’d like to install or build the package yourself.
2. Make sure your computer has working adb. Setup instructions can be found here.
3. Enable USB debugging on your device.
4. Run adb -d reboot sideload.
   warning

   Important: The device may reboot to a blank black screen, fear not, this is a known bug on some recoveries, proceed with the instructions.
5. Run adb -d sideload /path/to/zip (inserting the path to your LineageOS package).
   check

   Tip: Normally, adb will report Total xfer: 1.00x, but in some cases, even if the process succeeds the output will stop at 47% and report adb: failed to read command: Success. In some cases it will report adb: failed to read command: No error or adb: failed to read command: Undefined error: 0 which is also fine.

6. (Optionally): If you want to install any add-ons, click Advanced, then Reboot to Recovery, then when your device reboots, click Apply Update, then Apply from ADB, then adb -d sideload /path/to/zip those packages in sequence.

   info_outline

   Note: Add-ons aren’t signed with LineageOS’s official key, and therefore when they are sideloaded, Lineage Recovery will present a screen that says Signature verification failed, this is expected, please click Continue.
7. Once you have installed everything successfully, click the back arrow in the top left of the screen, then “Reboot system now”.