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 ...

I have a W98 Compaq laptop. While booting, it displays the following:<BR><BR>The following files are missing or corrupt:<BR><BR>command.com<BR><BR>then...it displays:<BR><BR>bad command or file ...

If you receive an error message – Failure when attempting to copy boot files, then this post may be able to help you fix the problem. BCDBoot is a command-line ...