The phone has a bad esn for a reason and coming from craigslist it could be stolen. So you wanting to change a serial number on a phone that might be stolen is very illegal. Best thing to do is swap the two boards like Rich said. Very easy to do.
1- Remove battery cover, battery and memory card.
2- remove 6 screws around the edge
3- pry back cover off
4- remove 1 screw top right hand corner
5- undo the 2 flex cables on middle left side.
6- Remove board
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