I think I can only do as explained here:
https://www.microsoft.com/surface/en...-10&=undefined
Surface Studio, Surface Book, Surface Pro 4, Surface 3, or Surface Pro 3 with a configured boot order in UEFI
Step 1: Shut down your Surface.
Step 2: Insert the bootable USB drive into the USB port on your Surface.
Step 3: Press the power button to turn it on.
Step 4: Follow the on-screen instructions to boot from your USB drive.
how do I select it manually?
