If you have the Pickit 3 Programmer (software)
with the pic24f2450 in the board from Joshua Systems, and jumpers set to L
and connected to the Pickit 3
1 Close the PICkit 3 Programmer software if it's already open.
2 Open the PICkit 3 Programmer software.
3 Choose the PIC18F2450 in the drop down list.
4 On the left, just above where it says Program Memory, click on the button that says "Read"
5 after if gets done, just slightly below where where you choose the PIC18F2450, it should say "Checksum:" with a value of 0A6F.