What method you was using to update BIOS?
Try install ME driver 10.0.31.1000 from msi website
http://www.msi.com/support/mb/X99S-GAMING-7.html#down-driver&Win8.1 64
Try install ME driver 10.0.31.1000 from msi website
http://www.msi.com/support/mb/X99S-GAMING-7.html#down-driver&Win8.1 64