Do you mean DOS or an NT command prompt? AFAIK, most BIOS updates are done in either DOS or GUI Windows. A command prompt only NT is a bit tricky, and not very useful anyway. A DOS booting USB stick ...
This FAQ will show you how to create a bootable USB drive to install Windows 7, Windows Vista, Windows 8, and Windows 10. This sort of drive is especially useful for mini laptops that don't come with ...