Writing file through OBDII is the issue, need a converter box like AVT 852 which are available for sale.

I tested an ADX file made for AVT cable today that dimented247 is writing and he said it would not work on his truck but it worked fine on mine.

Look at sticky in TunerPro OBDII section for link to dimentred247 XDF files for TunerPro. They work great with a RoadRunner...

There are already several LS1 ADX files done either Elm or AVT...