You should be fine. You'll probably find answers on the Diablosport forum. They have a good selection on updating. When it gets through updating, if there are any issues. Just unplug and do it again. Make sure not to start the engine before installing a tune. I did that Sunday and it went nuts. I really don't like it when the engine keeps running after taking out the key. But it quit after a few minutes, I reconnected and did not start it and everything was fine.
Here's link http://www.diablosport.com/forum/