Power off your phone, hold both Volume buttons, and plug it into the PC. The tool will automatically exploit the bootloader and flash a blank VBMeta configuration, permanently disabling AVB verification until the next stock firmware flash. Troubleshooting "VBMeta Error" and Bootloops
--disable-verity --disable-verification
heimdall flash --VBMETA vbmeta.img --no-reboot vbmeta samsung a12
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Press again to confirm and unlock the bootloader. Your device will wipe itself and restart. Power off your phone, hold both Volume buttons,
avbtool make_vbmeta_image \ --flags 2 \ --padding_size 4096 \ --output vbmeta_custom.img
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(Verified Boot Metadata) partition is a security feature used in Android's Verified Boot
This method uses Magisk to patch the entire AP (Application Processor) firmware file, automatically disabling verification and dm-verity.