If you want, I can:
[Boot to TWRP Recovery] ➔ [Wipe System Partition Data] ➔ [Flash Custom ROM Zip] ➔ [Flash GApps Package] ➔ [Reboot System] Step 1: Wipe the Legacy System
: Flashing will wipe all internal data. Ensure you have a full backup.
When searching for the keyword, you’ll encounter terms like “full package” or “full ROM.” Here’s what that means for the Vivo 1801: