Updated the SCT device 3 days ago before I loaded the canned tune, ran that for a few days and decided I wanted to go back to Ericks LET tune. So, I plugged it in and went about it and it seemed to load fine. An hour or so later I go to hop in and start my truck, nothing. So I panicked and immediately plugged in the tuner to return it to stock and it wouldn't let me. So I turn the key off and try again and the truck starts throwing messages like crazy and the tuner still wouldn't recognize that the key was turned oñ so wouldn't let me return to stock. Tried to see if the tuner would read any codes and it gave me error code #21000. Can't even get ahold of SCT support as they are closed on weekends. Also tried disconnecting the battery and it didnt change anything. If anybody could give me any suggestions I would really appreciate it.