Once Advanced Startup Options screen appears, select Advanced options > Firmware settings. We know that there ... is to boot into UEFI or BIOS. It works as follows: /fw – Combine with a shutdown ...
You can now release the Volume Up or Volume + button as soon as you land on the UEFI Firmware Settings page. If you have a Surface Book 2, Surface Book 3, Surface Pro X, Surface Pro 7, Surface Pro ...