I found a step by step calibration on the Forscan website forum. Mine was a little different. I did not have anything that said "Rear Camera Calibration", instead mine said something like "Local Interconnect Network" I highlighted it and clicked the play button at the bottom. It to less than 10 seconds. It took me 30 minuted to get my cable to communicate. I found all of this info on the Forscan forum. Take a look at this "https://www.forscan.org/forum/viewtopic.php?f=16&t=8197"