I received a message that the RC signal was lost after I updated the firmware. After trying hours of trying to find a solution on line and talking to DJI I was very frustrated. Scanning some Youtube articles I found one on resetting the RC Link. I tried this and it worked! There is a reset button on the left side of the aircraft. Use a pencil to push in the lighted recessed button which was yellow. It reset the RC Link and turned green which fixed the problem.