Ok, so since the addition of SPARK to GO, nothing has worked right (just a time reference... I don't claim to know the cause). Was out on a professional shoot with the Mavic, and my Galaxy S7 kept losing contact with the remote. It resulted in a complete loss of control. I couldn't land and couldn't fly. It took off, and then just hung there. No, nothing else was running on the phone, but I couldn't discout the fact that phones do have other "stuff" installed on them. So, I did some research and found a ton of people that like the Galaxy S2 tablet. Picked that up, and ONLY installed the GO4 app, and the Lightbridge (for my S900) app.
I haven't tried Lightbridge yet... but GO just won't connect.
I tried 3 different cables
I tried developer mode
I tried restarting all devices (in every possible combination of startup)