I could try version 3.1.8 with all the description before. It works very well and I was able to go to 1,200 km. The problem is that the video has a lot of interruption but comes back from time to time.
I have a phantom 3 SE in France and since the firmware 1.5.40, the distance is very small, less than 300 meters.
My tablet is a samsung tab S2.
I can not change the frequency to 2.4 Ghz. It automatically goes into 5 ghz.
Do you have a solution ?