It's a corrupt BIOS.
The best solution is to RMA the board. You don't know what else may be wrong with it.
The ONLY other possible thing you can do, is to find an "engineering version" of a MS DOS commandline BIOS flasher, that has the ID checks disabled (this is also what you use for crossflashing boards of a similar category) and seeing if that will let the BIOS be flashed. If it's an AWARD BIOS, there was an engineering version of AFUDOS (can't remember the version) that was out around 2007, that let you backflash bioses that were not supposed to be backflashed. I'm getting way out of my league here, though. I don't know any more, sorry