I have a 07 Dodge Nitro 4.0L with a bad TCM. I got a used one from the wrecking yard, but it sets a P1644 mismatch code. I'm trying to figure what would be involved to get the proper TCM software and to write it onto the used TCM? The old TCM doesn't seem to be readable. I was able to read the used TCM. The HP Tuners software even had a pop-up that said it would load the updated software when I was reading the used TCM, but I'm worried that it would just be updating the mismatched software that is currently on the used TCM. I've only really used HP Tuners for bench programming 6L80 TEHCM's, and not much else.