Re: 1f5a e6400 solved!

I am trying to remove a -1F5A password from a Dell Latitude E4310 by downgrading the A11 BIOS to A09. I can download the BIOS .exe (E4310A09.EXE) file from Dell and copy it to the root directory of the laptop loaded with Windows 7. From the CMD prompt I can navigate to the root directory. However on executing the command E4310A09.EXE /writehdrfile I get a message "Invalid Command Line". My DOS is a bit rusty so I must be missing something. I have also tried this by booting from a USB and executing the above command directly in DOS, but nothing happens....