Hi robble and Welcome to ROG.
Latest Bios for your MB is 1903, I suggest you update for better stability. Go here:
http://www.asus.com/ROG_ROG/MAXIMUS_V_FORMULA/HelpDesk_Download/Download the Bios file to an empty (Fat32 format) USB stick and, at the same time download the renaming tool from Bios Utilities.
Activate the renamer and this will convert the Bios file to correct Bios file format.
Follow the instructions in your manual for Bios Flashback. I don't have a copy of your manual for exact method to use.
We owe our existence to the scum of the earth, Cyanobacteria
My System Specs:
MB:ASUS ROG Crosshair VII Hero/WiFi GPU:EVGA GTX 1080 sc PSU:Corsair AX-1200i
CPU:AMD R7 2700X Cooler: Corsair Hydro H115i Case: Corsair Carbide 780t
Memory:G.Skill TridentZ F4-3200C14D-16GTZR SSD:Samsung 500GB 960 EVO M.2
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