Because standard Fastboot is unavailable, the most reliable method for the A12 involves these steps:

Disclaimer: Flashing custom binaries can result in a damaged device. Ensure you know your model number (e.g., SM-A125F) before beginning.

After testing dozens of patches and reading hundreds of forum posts, the VBMeta solution is context-dependent:

Generic disablers often trigger Samsung's "Red State" warning, which forces a 10-second boot delay. The best patched VBMeta files convert this to "Yellow State" (warning but no delay) or "Orange State" (fast boot).

Always create a backup of important data before making changes to the device's software.

: It contains cryptographic digests used for Android Verified Boot (AVB) 2.0 . If you modify the system or boot partitions, vbmeta will detect the mismatch and prevent the phone from booting.