After a few successful initial flights, I tried calibrating the joysticks, but was unsuccsessful, and now I have no joystick control whatsoever. And now I find it's impossible to actually complete the calibration procedure before the sequence times out.

I've tried at least ten times, restarting the app, the phone, and the remote, but to no avail. The target circles just never make it around the square before timout! Only ONE time did ONE circle actually complete the journey.

How do I complete the joystick calibration? Or, if that's impossible, how can I reset the app so I can use the joysticks again? The remote control is kind of useless right now.

The app is up-to-date, version 4.2.21   I'm using it on a Samsung S5 Active, which also has current software.

I hope this will help you:

Uninstall 4.2.21! Install 4.1.16 !!!!!!!!!!!!! After uninstalling 4.2.21 delete the application folder 4.2.21 then install the old application with version 4.1.16! Connect to the RC and do the calibration successfully

the hardware Samsung S5 not work fine with new version GO-4.2.21! it's old ''hardware'' machine for new version software from DJI

Actually did it!!   It can be done by constantly moving the joysticks back and forth over the path, and the circles will move. You can't just follow them, you have to sort of keep vigorously nudging them along. Jeez. What a waste of the past hour figuring this out...

I'm coming back ... with a joke ... a parody! Dear DJI engineers: In the next version of DJI-GO (Android 4.2.22 ... 23) we will need 16-core CPU devices ... 16Gb RAM ... GPU Nvidia X-force?!?!?!? (8gb ram-video) Where do we go?

Hi. That is good to know that you are able to fix the issue. If you have any other concerns with your Drone please feel free to post for us to help you. Happy flying.