Phantom 3 Pro won't connect to dji app

[REL]

Did you or the previous owner do a firmware upgrade recently ? Your text is the same as his at the very end. #8 and #15 devices not detected. Start with post #30 in this thread: Professional - P3Pro - Firmware Update Mistake

 

[Chas Har]

Fixing flash programming in DM365 chip within GL300 remote controller

Here you will find not only instructions to blindly follow, but an explanation of what you're really doing. Fixing is also preceded by diagnosis - this is how all repairs should look like. So, here is the link to my DM365 chip reflashing tutorial, with specific tasks performed on GL300 RC...

phantompilots.com

I saw this on the search. Looks like you have the same issue with 8 and 15 code not detected. Not sure if my link is the same topic as above, but do a search and you will see many have had the same issue, some reporting back that that they sorted the issue following the instructions. Hope it helps.