I've got an ASUS p4b266-C.
I flashed it with a p4b bios by mistake, i figured they were the same thing. It flashed but now my on board USB is it screwed up. Now i am tring to flash it with a p4b-266c bios. I've tried every single one, the original i saved and the same bios thats currently on there and it gives me a check sum error. Any ideas?