E67 GMPP controller checksum error

[xtreme]

I installed 2 new LS3 installs in muscle cars with GMPP controller kit. The E67 has OS 19211212.

I now have 2 E67 controllers on 2 different cars that have the GMPP harnesses and controllers that give me checksum errors when I read the ECM's. I need to modify the files for the cam changes and to complete the tune on these cars.

It seems odd to have the same problem with 2 different setups. Not too sure if I am doing something wrong. I have not had this issue with other E67 or E38 controllers in the past. I attached the file that I read.

Any ideas?????????

Anyone have a good file?