Hi
I take it from what you have said that you tried to update the BIOS using the @BIOS program which is totally opposite to what we always recommend. I would say it is likely that you have corrupted the BIOS now and luckilly you have a backup BIOS chip[ on these Gigabyte motherboards or the board would be toast.
Try this. t might take a few attempts to get right.
You can kick in the backup BIOS by shutting down the PSU from the wall, then hold down your case power button in and then turn on the power supply button, a few seconds later the board will start, shut off the power supply then. Then you can turn on the power supply again and power up the board normally and DualBIOS will kick in.