Use Winflash or Asus updater at your own risk. Winflash has bricked many many Notebooks don't use it. Use Ezflash from within the BIOS itself.
try F2 or Del on boot up to get into your BIOS These notebooks load fast so you may have to try a few times to catch it I usually just spam the key from the time I hit the power on button.
Another thing with windows 8 you have to insure you are getting a complete shut down, as default is Hybrid Shutdown which is really only sleep mode or Hibernate really. If your doing that your can't get to your BIOS because you never shut down enough to get to it.
http://rog.asus.com/forum/showthread.php?32165-Cannot-enter-BIOS-G75VW maybe this thread will help you.
G752VY-DH72 Win 10 Pro
512 GB M.2 Samsung 960 Pro
1 TB Samsung 850 pro 2.5 format
980m GTX 4 GB
32GB DDR 4 Standard RAM
Z97 PRO WiFi I7 4790K
Windows 10 Pro
Z97 -A
Windows 10 Pro