Hi,
I am trying to boot from USB thumb drive or DVD drive attached to it but with no success.
I do not know what is wrong because the some thumb drive & DVD is bootable on Asus N55SF.
I am powering the strix, pressing "ESC" and got boot menu.
In the menu I got two options: first is internal HDD, second UHCI USB
But when I chose the second one menu restarts and show again those two options (looks like endless loop).

The thumb drive / CD is bootable Hiren's Boot tool. I wont to create image file of my system partition with Norton Ghost included there.

I can boot the DVD drive with Windows 10 1709 inside.

Is there a way to boot Hiren's Boot CD on GL503?
Or maybe other way to do this job (image file).

Waiting for response (no idea what to do next).
I am not familiar with newest BIOSes.

Pawel