To bypass security checks for custom software, users often use a "null" or patched vbmeta. You can create one yourself using the vbmeta-disable-verification tool on GitHub or by following guides on community forums like XDA Forums Modifying the partition requires an unlocked bootloader , which will permanently trip your Knox counter
Verity checks partition hashes; verification ensures the partition hasn’t been tampered with. Both must be disabled for custom partitions. vbmeta samsung a12