There are multiple threads for this, if you still have your original windows installed you can do the CTL HOME routine try it several times. If you have clean installed or some other way removed the BIOS for from the root of your C:\ Drive. Don't bother as that is the file that EZFlash will look for.
USB thumb drive should be formatted FAT32
The USB thumb drive if you try this be sure to extract the downloaded BIOS directly to the root of your USB Thumb drive.
Do No Extract/Unzip to your hard drive and then copy to USB Drive
It is very important to unzip the file directly to your USB Thumb drive.
Also take note that using the right side USB ports there have been issues with the left side ports they are on a daughter board so why take a chance.
You must know by now that if you can't resolve this you'll have to RMA
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