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Checksum error when trying to save.
Hi guys, I'm completely new at this, I've gotten to the point where I've used PCM Hammer to open my OS which is 12209203. When I go into Tunerpro, make a few adjustments, deleting VATS, setting the max speed to 200, and taking out P0420 &430, then try to save it gives me a checksum error. I'm not sure if those adjustments aren't allowed, I'm doing it wrong or what. This is just a test PCM I took out of a junkyard truck, I'm trying to successfully complete these steps before I look into my swapped truck. I did save each item in each block before trying to save the whole program.