Have you tried using BIOS Flashback. It's mentioned in the manual Section 1-6. Not sure if it can fix a botched update, though. Just download the latest BIOS version, put in on a USB drive, plug it into a USB port and follow the rest of the directions in the manual. Might be worth a try.
Edit: I removed the renaming part, it might have been for a different utility, so never mind that.