Posted on duramax diesels as well.. I have searched and read and searched more to no avail on this so its time to ask the experts. I have an 01 truck and have dsp5 efi on it, my problem is no matter if its the 441 OS or the 6006 OS and no matter the vin (I have used an 01, 02, & 03) I always get a black screen on the cts when it powers up each time that looks like the photo attached. The 02 or 03 vin both let me see the pids on the cts but still wont let me switch tunes.

Any help would be greatly appreciated as I would love to get this working. Thanks in advance!

Ben