memtest86 won't boot of USB

[frozen_sun]

Seems the issue might be with the motherboard as others have issues using USB boot devices, per the threads on Asus forums,

https://rog.asus.com/forum/showthrea...d-boot-devices
https://rog.asus.com/forum/showthrea...load-USB-Win10
https://rog.asus.com/forum/showthrea...UEFI-USB-stick

This post suggest using F8 at startup instead,

https://rog.asus.com/forum/showthrea...-not-available

Or try unplugging all the other drives on your system to see if it will boot from the USB Drive.

As I said I see bootable USB device but when I chose it it gets my to BIOS,

[Richard (PassMark)]

Seems the issue might be with the motherboard as others have issues using USB boot devices, per the threads on Asus forums,

https://rog.asus.com/forum/showthrea...d-boot-devices
https://rog.asus.com/forum/showthrea...load-USB-Win10
https://rog.asus.com/forum/showthrea...UEFI-USB-stick

This post suggest using F8 at startup instead,

https://rog.asus.com/forum/showthrea...-not-available

Or try unplugging all the other drives on your system to see if it will boot from the USB Drive.

[frozen_sun]

I made bootable usb memory stick but when I press F6 and choose boot from kingston usb it reverts me into BIOS and memtest86 doesn't run.
What is the problem?
Bios is UEFI and motherboard is Asus Crosshair Hero VIII.