It's not enough to just factory reset an Android phone before selling it
How to protect my Android phone from a hard factory reset - Quora
3 Efficient Ways to Fix Android Recovery Mode Not Working
Samsung A12 Not Working 🚭 Hard Reset || Samsung A12 Factory Reset Not Showing 2022 | New Update 😲😭 | Samsung A12 Not Working 🚭 Hard Reset || Samsung A12 Factory Reset
how to fix wipe data/factory reset option not available on Samsung - YouTube