I wanted to update the bios on my old motherboard "Asus P5B" https://www.asus.com/Motherboards/P5B/#support
but when i try to select an OS it only goes up to windows 7 64bit, I have win 8.1 and I can't select it.
Will it hurt my motherboard if i try to install the win 7 64 bit version or will it brake it ?