The Asus files (after PFAT) contains the bios region (NOT a full firmware image!!), some duplicate volumes (unclear) and an ME update in 9F8B1DEF-B62B-45F3-8282-BFD7EA19801B
Your bios region is the padding and the EFI volumes up to 0xA00000 (address in update file) and the bios region of your dump is 100% identical despite NVRAM 0x640000 (address in dump) and machine specific information 0x660000 (address in dump), which is expected.
So if this really was related to a bios update it has to be the ME update. But ME seems to unpack OK, config can be read by FIT. So nothing really obvious. You might try to clean/reinitialize the ME of your dump according to
Otherwise there would be only NVRAM. You’re really sure that you didn’t change some settings before the brick?