I had success ordering a replacement BIOS chip from
Bad Flash. ~$40 USD
I found your mobo's website
Biostar 945GC-M4 7.x. I couldn't find any BIOS update there.
If you cannot buy another BIOS chip, or pay a technician to reflash your chip. You may be able to
hot-flash your existing BIOS chip. Your BIOS chip appears removable, as shown in the manual and the webpage illustration. "Borrow" the working BIOS chip from an identical board, then:
-- Disconnect all power to the board, ground yourself, discharge the board by removing the battery, wait 5-10 minutes.
-- Remove your bad BIOS chip, put fishing line behind the good chip (both ends of the fishing line extending 2-4" from the chip), insert the chip into the socket.
-- Replace the battery, connect power to the board.
-- Turn on the machine, and let it boot to the operating system.
-- Using the fishing line you placed behind the good chip, carefully pull the good BIOS chip from the mobo.
-- Aligning the bad BIOS chip to the board's BIOS socket, carefully insert the bad BIOS chip into the socket.
-- Let the machine a few minutes, then shut down the machine.
-- Restart the machine to make sure your BIOS EPROM was re-programmed from the good chip (if not, do it all again).
-- Return the "borrowed" chip to its owner.
It's kind of intimating, but I had to do it to my DFI board after I had a bad flash, and it worked. Good Luck!