Dell Studio XPS M1340 (Mid 2010) - Manual (Page 39)

14. Replace the coin-cell battery (see Replacing the Coin-Cell Battery ).
15. Replace the base cover (see Replacing the Base Cover ).
16. Turn on the computer.
17. Insert the BIOS upgrade CD that accompanied the replacement system board into the appropriate drive. Follow the instructions that appear on the
screen.
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NOTICE: Before turning on the computer, replace all screws and ensure that no stray screws remain inside the computer. Failure to do so may
result in damage to the computer.
NOTE: After you have replaced the system board, enter the computer Service Tag into the BIOS of the replacement system board.