Link here:
http://www.usfirst.org/roboticsprogr...t.aspx?id=4094
If you imaged it, did you check to make sure you formatted the crio when you did so as well? It's a checkbox on the image window that can bite you if you don't check it. Did you also verify the correct IP?
When you redid the firmware on your DS, did you reset team number to the correct one? (This sets IP if I remember right).