Here are some general facts about vbmeta files on Samsung A12:
via Magisk will often result in a frustrating "vbmeta set warranty bit" error or an endless bootloop. Here is everything you need to know about why this happens and how to fix it. and Why is it Blocking You? (Verified Boot Metadata) image is a critical part of Android Verified Boot (AVB) 2.0 vbmeta samsung a12
: Put the phone in Download Mode and flash the new tar file. Important Considerations Here are some general facts about vbmeta files