Over a few updates and rollbacks, somehow my UUID and Serial changed. What I have tried so far:

AFUWin/AFUDos

FPT: Flash Protection Range Registers (FPRR) error, even after attempting to set to zero lock/fprr via efishell.

Flashback w/ UUID and SN modded into .CAP through FD44.

Are there any options to recover?

Hi friend, have you a previous bios backup, when all was ok ? , have you the UUID and Serial wrote somewhere ?
If yes, then they are recoverable ...
Regards