Plug in the USB drive you want to format, and open File Explorer. Identify the exact drive name of the USB drive. Make sure not to make any mistakes here. If you use an incorrect drive letter, you ...

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 ...