If you have another board that has a pin compatible BIOS chip (or ahave a friend with one) you can do the following:
Boot the good board.
Pull out BIOS chip while the board is running
Insert your BIOS chip
flash it to the appropriate BIOS (if it's not the same board, you'll get a warning that you're flashing to a different board's BIOS)
turn off the computer
swap BIOS chips, and put yours back in your computer.
I've done this before on my A7N8X - E Deluxe with another A7N8X-E Deluxe.
This tool is
very helpful in pulling the BIOS chip out:
http://www.radioshack.com/product.asp?catalog%5Fname=CTLG&product%5Fid=276-2101
Check this thread for more info:
<a target=_blank class=ftalternatingbarlinklarge href="http://www.nforcershq.com/forum/viewtopic.php?t=15104&postdays=0&postorder=asc&start=0
">http://www.nforcershq.com/forum/viewtopic.php?t=15104&postdays=0&postorder=asc&start=0</a>
There are people that have flashed an ASUS bios in an NF7-S and all kinds of other motherboards. As long as the BIOS chip is pin compatible, it appears that just about any board will work.