Go to http://forums.tweaktown.com/gigabyte/28441-gigabyte-latest-beta-bios.html
Download UEFI back to AWARD in the z68 category
Click on Previous BetaBIOS in the z68 category
Download GA-Z68X-UD4-B3 - F10e
Prepare a DOS bootable USB flash drive formatted to FAT32, and copy the contents of both download archives onto the flash drive.
Boot from the USB flash drive, and follow the instructions in the readme to execute EFI2AWD.exe <bios filename> and begin the flash process.