For brands like Samsung, ensure that the combination or bypass firmware matches the exact binary security level (e.g., U1, U2, S3) currently installed on the phone. Downgrading security binaries is blocked by device bootloaders and will fail.
Some analyses suggest the BerBoToss family may include worm-like capabilities, attempting to spread through local networks or USB drives to infect friends' and family members' computers, just as the user warning indicates. berbotoss frp firmware