Use BIOS version F3D and use alt f12 at beginning of POST to copy the main BIOS to the backup BIOS. Your problem is F4 is not stable (people have had various problems with it, including unable to overclock past 4.4 ghz without 1.2 VTT (confirmed bug), and you need to copy main bios to backup BIOS but flash F3d first. (after flash, and after setting your settings once first and successful boot, hold alt f12 before you see CPUID strong appear at beginning of post).