Der er en anden side der har haft problemet oppe på et andet PC mærke, men med samme BIOS:
https://superuser.com/questions/507111/if-usb-is-not-listed-in-bios-as-a-boot-option-does-that-mean-the-machine-cantDer kommer bl.a. et forslag der siger:
down vote
I just went through the same pain... but I found a workaround.
Plug in your USB drive
Turn the Zenbook on
Enter UEFI (BIOS) through pressing ESC or F2
In 'Boot' tab: 'Disable Fastboot' (*)
Press F10 to save & exit
Immediately press ESC or F2 again
In 'Boot' tab: your USB drive should be listed - change the order
Press F10 to save & exit
Your Zenbook should now boot from the USB drive
profit
(*) = and 'Enable CSM' if you want to boot in legacy mode
If that does not help, you might need a more recent firmware version.
Just in case you run into more trouble while trying to install Windows onto your GPT SSD - this post might be very helpful:
http://www.hodgin.ca/2012/10/02/creating-a-uefibios-windows-7-usb-and-installing-to-gpt-partitions/"Secure Boot Menu" indeholder ikke noget "nyt", med mindre "Secure Boot", der er sat til "Standard", kan sættes til noget "spændende"...