dont think you can revert back without replacing the bios chip.
from another thread "Resetting the CMOS won't recover the previous BIOS version but it will reset your BIOS settings if that's the problem. Hopefully your BIOS chip has Boot Block protection and you made a backup of your old BIOS before flashing.
I'm assuming it's the asrock mobo in your signature? Have you tried to simply go to their website, download a different bios version for your board and flash it manually? If asrock only allows a forward upgrade some flashtools also have a command-line version and support for a "/force" command to expedite this very task. One can also trick a mobo that has a bios recovery mode, but we can cover that if nothing else works.
I take it a downgrade is not supported? In what method do the Asrock boards upgrade (boot into flash tool, or windows flashtool?) Check your documentation, because my MSI board has a disaster recovery mode where I can flash a new bios via usb pre-POST.
I boot into the flashtool and did it from my bios ( put new bios on usb ). I'm thinking of buying a new bios chip off eBay programmed with older bios or send it into the company I got it off for them to fix it? The chip is £10 & to send it to them is about £9. Is it safer to send it to them ? I'll have to pay postage back if nothing is wrong though.
You should be able to flash the BIOS with any previous version to bring it back to what you originally had, if that is what you're asking. If you simply want to reset it to factory default of the current BIOS, you can do that within the BIOS setup.
You would roll back your BIOS the same way you would update your BIOS; either using DOS, the Windows Utility usually provided on the motherboard disk, or with the Instant Flash utility Asrock has. You simply use the BIOS file of your choosing selected from the links on the Asrock site I sent. If you are unfamiliar with those options, you may want to do a bit of reading first.
Mate you are actually a genius! I didn't know you can just roll back your bios by installing the old one , I thought it wouldn't let me. I would of had to send my whole motherboard off just to fix my little problem. Also the reason I want to roll it back is because after updating to the latest bios my ram has been unstable and wouldn't let me run it at full speed ( 1866Mhz or 2000Mhz ). Now hopefully the problem is gone.
Yuup two bad cards in a row from XFX. Bought the XFX Radeon 6790 & It had a faulty capacitor and would make a high pitch noise. Now my 2nd card has a faulty pixelator ( from what I can see ) and crashes my display randomly. They won't even offer me a free upgrade etc just free case badge and stickers haha.