For starters, you can backup your original bios from GPU-Z. Just click on the icon to the right of the, "Bios Version" box and select save file.
Here is how to DOS flash. I simplified it for you:
Directions on how to make a bootable USB with the bios and flash utility:
*Creating a Bootabe USB*
Quote:
1. Make a USB bootable drive using this creator:
USB Boot drive (HPUSBFW)
2. Then download the boot files and extract them to a folder of your choice
3. Run the HPUSBFW program.
Select the correct USB device from the drop-down menu, set file system to FAT32 and check Create a DOS startup disk.
4. Then browse for the extracted boot files (now in the folder of your choice) and press start to begin formating it.
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*For ATI bios*
Quote:
1. Download ATI Flash tool (Dos) on the USB drive.
2. Get the bios you want to flash (rename it newbios.rom).
3. Reboot and select the USB to boot from.
4. From there use the appropriate command to flash:
ATI Flash commands...
atiflash -s backup.rom (Backup Original Bios)
atiflash -p -f 0 newbios.rom (Forced Bios Flashing)
for the second card in crossfire plugged into the 2nd PCI-E slot use the following:
atiflash -p -f 1 newbios.rom
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*References*