LineageOS 18.1, 20 and 21 Installation Guide

Before installing LineageOS, first make sure you're on Android 11 firmware (flashed stock A11 at least once). You can also install if you're using android 12, 13 or 14. If youre using cc9e/have converted your phone to cc9e you have to FLASH STOCK ROM first.

MAKE SURE YOU BACKUP YOUR IMPORTANT DATA!

Step 1: Download the latest build from the release post

Step 2: Sideload the build from recovery mode using adb (adb sideload ROM_FILENAME.zip) or from sdcard/external device. When coming from stock rom it's best to flash both slots with the recovery: fastboot flash boot_a boot.img and fastboot flash boot_b boot.img
Step 3 (optional): reboot to recovery, flash gapps using adb (adb sideload GAPPS.zip) or from sdcard/external device

Step 4: Format data, and reboot

Which gapps should i choose? 

Recommended Gapps Packages: 21, 20, 18.1

Don't like mindthegapps? Try:

1) https://nikgapps.com/

2) https://opengapps.org/

How to sideload the build from recovery?

If you're using lineageos recovery: click "Apply update" (or Install), then click "sideload from adb" if you want to sideload using adb, or choose an external device/sdcard