I don't think you are doing anything wrong, you just don't have the non-ATT files downloaded.
It's fine to run those tunes as long as you keep the power level low.
I'll look through my notes again tonight to see if I still have the link where I downloaded all my tune files.
Greg
2012 | RAM 2500 | CCSB | Custom tuned by Double R Diesel
2016 | Heartland Pioneer | DS310
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