You need three files msdos.sys command.com and io.sys to boot into a dos environment.[[BR]]
To Format the USB Stick , I used to the HP Utility called {{{HP USB Disk Storage Format Tool }}}. Run the HP utility with the location of these 3 files and you are done. [[BR]]
Once the formatting is done copy the utility to flash your rom and the image to flash it with on to the USB stick.[[BR]]
On LV678 the BIOS saw USB stick as a hard drive and I raised its priority ahead of the SATA disk and the machine booted into the DOS environment.