Compaq 247320-003 - Deskpro 4000 - 5166 Model 2500/CDS Reference Manual page 46

Your computer comes with reprogrammable flash ROM (Read
Only Memory). By establishing a setup password in Security
Management, you can protect the ROM from being
unintentionally updated or overwritten. This is important to
ensure computer operating integrity. Should you need or want to
upgrade your ROM, you may:
Order an upgraded ROMPaq diskette from Compaq.
Order the Support Software CD for Compaq Desktop,
Portable, and Workstation Products.
Download the latest ROMPaq images from the Compaq
World Wide Web site (www.compaq.com).
To upgrade the ROM after you receive an upgraded ROMPaq
diskette, complete the following steps:
1. Insert the ROMPaq diskette in the diskette drive, enter the
correct command, and the computer will prompt for the
setup password.
2. Enter the setup password.
If the setup password is entered correctly, the ROMPaq
utility will take over and run the flash ROM upgrade.
Do not turn off the power to your computer until the
ROMPaq utility has completed the upgrade process.
If the setup password is incorrectly entered, the procedure
will terminate and no changes will be made to the ROM.
3. When the utility finishes upgrading the ROM, remove the
diskette from the diskette drive and restart your computer.