transmission quality;screen update;region;ipad

I have a Phantom 3 Pro that has a sketchy problem with the video signal. First off I must say that it has the latest firmware, all the connections I checked (no electronics expert but as far I could see) seem in good state. I have done all the things, such as SD card, IMU, Calibration. You name...

Image Transmission Settings > Channel Mode > Custom is grayed out if the phone or tablet is set to some regions. At first I thought the limitation was caused by my old and semi-unsupported iPad mini 1 A1432 but the following thread provided the answer: Cant activate custom channel In that...