Well, it could be tricky since UBU doesn`t fully support Asus bios :
2) "Error in Replacing File- to update the microcode on X99 Asus, MSI, Gigabyte. The Volume, where the microcode, fixed by changing the size.
http://www.win-raid.com/t154f16-Tool-Guide-News-quot-UEFI-BIOS-Updater-quot-UBU.html