You can downgrade your BIOS. But make sure that you have the correct version and follow instructions properly.
It's also advised that you have a backup of your current BIOS on floppy disk which you can use to re-write the BIOS in case the procedure fails.
BIOS upgrades can be risky. Many people have ended up with worthless motherboards because of a badly flashed BIOS...Though it tends to be due to incorrect versions, problems can occur even with correct versions.
Happened to me once. I tried to flash the BIOS CMOS with a new, compatible version. Died on me. Luckily my PC was still on Compaq support and they replaced the motherboard for free.
Also, new BIOS versions contain vital improvements and bug fixes. So downgrading for one feature may not be benifiting overall.
|Desktop PC| |Macbook Air 13" (Mid 2013)|
|Windows 8.1 Pro (x64)| |AMD FX 4100 Black Edition 3.6 GHz @ 4.0 GHz OC| |Arctic Cooling Freezer 13 PRO| |Gigabyte Nvidia GeForce GTX 560 Super Overclock 1GB| |ASUS M5A78L-M/USB3 Motherboard| |Samsung 840 Pro 256GB SSD SATA III HDD| |Kingston HyperX 8GB PC3-14900 DDR3-1866| |OCZ ModXStream Pro 700W Modular PSU| |NZXT Vulcan Micro ATX Case|