Just trying to hover in my backyard, app says no fly zone, cannot take off. I'm like 4 miles from an airport. There's no option in the app to unlock it, despite what DJI's site says. So I go to DJI - The World Leader in Camera Drones/Quadcopters for Aerial Photography and unlock and it says it works, but I still can't take off. I thought maybe because I'm using an iPad without cellular, so I switch it back to wifi for awhile with the DJI Go app open, and then switch back to connecting to the aircraft, still no fly zone, cannot take off. Writing this post as I'm caller number 18 in DJI support queue. Ugh!