Question: asus how to boot from usb?
Answer: 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.