Your ADX should still work, that's what I use. Our corvette ECM's are pretty much the same as the other l98 cars. What I understand is that they have a different part number because they have the water resistant case. My TunerproRT was having connetion issues too. Took me forever to figure it out, nobody knew. Try opening TunerproRT then click HELP and then Check Internet for updates. That fixed my connection problems. It found an update.