I had a problem with the BUILD809, not bad but annoying, I did not realize it before working.
If I leave the original settings of the camera after installation, no problem, it connects correctly to the T PLUS.
If I change only one of the parameters, for example the frequency of the 4K that I put in 25p (which is original in 60p), or in photo I go from JPG in JPG & DNG and that I put out drone and camera, then I turn back on, the camera does not connect anymore. I have to do a hard reset camera to be able to connect again, but I lose the settings I had just returned.
During my last mission (photos cathedral frontage), I had to change each battery, make a hard reset and enter the camera settings again to work.
I reinstalled a 784 and it works impeccable.
I do not know if others were concerned.