LineageOS 16 is the version of their OS based on Android 9 Pie.
However, as technology marches on, many devices have been left behind by official updates. If you are looking for an you are likely in one of two camps: you are trying to revive an older device that is stuck on an outdated version, or you are attempting to downgrade a newer device that didn't take well to Android 10 or 11. android 9 os zip file download
You can Download LineageOS for over 100 different models to get a clean Android 9 experience. LineageOS 16 is the version of their OS
Boot back into recovery (stock or TWRP). Perform a factory reset (wipe data/cache). If that fails, flash the zip again. If still failing, the zip is incompatible – find the exact correct version. You can Download LineageOS for over 100 different
The safest way to get Android 9 is through official manufacturer channels.
These zips contain the bootloader, radio firmware, and the system image itself. You typically flash these using the Android Flash Tool in a web browser or manually via Google for Developers 2. Custom ROMs (For Non-Google Phones)