Comentario oficial
A lot of these problems are frequently caused by the PAF switch not being in the F position when the app is launched. It is also likely that the DJI Go app is running in the background and attempting to connect as well. Be sure to fully close the DJI Go app.
Sometimes the DJI Go app will have a pretty good hold on the connection so unplugging the connection cable and closing both apps will sometimes be required.
Read more here:
http://support.dronesmadeeasy.com/hc/en-us/articles/206098446-Remote-Firmware-1-4-30-Issues