#First Time Install / Clean Flash 1. Have an unlocked bootloader & OOS 12 (C20 - C33) flashed to both slots. 2. Download vbmeta, recovery and ROM for your device from gdrive link in the pinned post. 3. Reboot to bootloader 4. fastboot flash recovery recovery.img fastboot flash vbmeta vbmeta.img fastboot reboot recovery 5. While in recovery, navigate to Apply update -> Apply from ADB 6. adb sideload ROM.zip. 7. Format data, reboot to system & Enjoy ! #Guide for flashing OOS 12 in both slots (from any oos 11 custom rom) 1. Use Msmtool to come back on oos 11 fw. 2. Do latest system update of oos 12. 3. Download latest full zip of oos 12 from oxygen updater app and install it manually. (For having oos 12 on both slots) 4. Unlock bootloader.