Dell XPS M2010 Service Manual page 109

NOTE: If you use a BIOS update program CD to flash the BIOS, press <F12> before inserting the CD so that you can set up the computer to boot from a
CD this one time only. Otherwise, you must enter the system setup program to change the default boot order.
29. Insert the flash BIOS update program CD that accompanied the replacement system board assembly into the optical drive. Follow the instructions that
appear on the screen. See Flashing the BIOS
NOTE: The Service Tag is located in the battery compartment.
To update the BIOS on the new system board with the computer Service Tag, press <F2> during POST to enter the system setup program. See
the BIOS.
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for further information.
Flashing