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Message: <blockquote data-quote="chscag" data-source="post: 1767161" data-attributes="member: 46727">Welcome to our forums.You're going to need to take the machine to Apple in order to "burn" the new serial number into the firmware.  I'm not sure those apps you cited still work.  I don't know of another method of doing it.  Normally, when Apple swaps out a logic board they take care of matching the serial number with the one on the new or refurbished board.Either that, or don't worry about the serial number being displayed.  If the machine is no longer under Apple Warranty, there should be no problem.  You can document the new serial number so that if your cousin ever decides to sell the machine he/she will have that to verify.</blockquote>