My bad for starting the thread in the wrong forum, but check this out
http://www.mp3car.com/vbulletin/gene...one-tried.html
Basically, the software would have to know about the new features of ELM327 v1.2 to make use of them. ProScan 5 is the only one I tried and v1.2 didn't make a difference in that software. I don't know which, if any, fully support the new features.