So I own an older 5.5 inch crystal sky which does not support dji fly. There is a fix however. if you already have litchi on the CS then go to the Amazon app and simply update. Litchi works great with the mini and CS. If you don't have Litchi installed then you have to purchase it from the Amazon store. It's well worth it as now you have a bright screen and all the great options of Litchi. You will have to fab up a mount but that's not too difficult