What the frak?
You're suppposed to flash your GPU bios, not the one on your mobo...
Try the search button, this subject was discussed many a time.
LOLZ.
D&T PSA:
Just to be clear.
If you don't know what you are doing DON'T flash your GPU bios. It is a good way to end up with a $300 paperweight. It is possible to put a custom bios on the card to make it do whatever you want. That is the only way around the 150 Mhz mem limit on 6000 series. It is somewhat risky, very easy to kill your card if you do something stupid and is 100% not supported by any warranty.
End D&T PSA