Dell LATITUDE D400 - Manual (Page 5)

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Flashing the BIOS
1. Ensure that the AC adapter is plugged in and that the main battery is installed properly.
2. Insert the BIOS update program floppy disk or CD, and turn on the computer.
Follow the instructions that appear on the screen. The computer continues to boot and updates the new BIOS. When the flash update is complete, the
computer automatically reboots.
3. Press during POST to enter the system setup program.
4. Press and to reset the computer defaults.
5. Press , select Save changes and reboot, and press to save configuration changes.
6. Remove the flash BIOS update program floppy disk or CD from the drive and restart the computer.
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NOTE: If you use a BIOS update program CD to flash the BIOS, set up the computer to boot from a CD before inserting the CD.