Hello! IMO, I think you're beating a dead horse with that motherboard and only 100 FSB. At any rate, the older boards, you downloaded the flash and utility to a floppy disk. Followed the instructions, booted with the new floppy, which started the Flash Utility, choose the flash file and hit ENTER. (Hope and pray that the power stayed on.
Are you sure you read the manufacture's instructions? Sometimes they can be missed.