This is the second post I see with the same problem.https://rog.asus.com/forum/showthread.php?t=101631Sent from my SM-G935F using Tapatalk

Are all the bios settings on their default value?Can be caused by an unstable overclocking or a faulty hardware.

When I first tried to update my bios on my crosshair 6 hero I made the mistake to think the bios of the "crosshair 6 hero" was the same as the "crosshair 6 hero (Wi-Fi AC)". That's why I was getting that the selected file was not a proper bios.Maybe ...