I would not even think of using a flash tool and here is why.Look at this link, GDE is getting into the OBD2 business as well. It is truly the best way to tune a car/truck. Once GDE gets into it, the Old methods will go the way of the Dodo bird. And there will be other companies doing it as well.
So using a flash tool could and most likely would vold your powertrain warranty. The dealer makes a whole lot more money replacing a engine or trans off of you then they do off of FCA! Nope I will just drive the 60 +/- miles to have them tune/update as needed.GDE said The flash tool leaves a footprint via flash counter, this could be an issue with warranty if dealer checks it. That is a benefit for bench flashing ecms, not change in flash counter.