BIOS downgrade help

Does anyone here know to flash a down grade BIOS for an Asus motherboard? I have a  p8-z77-V-LX and I upgrade the bios for what ever reason and now I can't change my CPU ratio and get an overclock going. I've tired to flash an older .cap file but it just says image outdated and stops there. any one know?

See if this helps.

LINK