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# Flashing the BIOS

Dell™ Latitude™ C640 Service Manual

To update the basic input/output system (BIOS):

1. Ensure that the AC adapter is plugged in and that the main battery is installed properly.
2. Turn on the computer and press to enter the system setup program.
3. Reset the boot sequence to boot first from the floppy drive or the CD drive (depending on whether your flash BIOS update is supplied on floppy disk or CD).
4. Insert the flash BIOS update floppy disk or CD, and reboot the computer.

The computer updates the BIOS and then automatically reboots.

1. Immediately press to enter the system setup program, and reset the boot sequence to the normal setting. Then exit the system setup program.
2. Remove the flash BIOS update floppy disk or CD.

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