First DO NOT use that controller to fly!
Second you can try a reset For most DJI controllers if you let the Battery get low enough for the controller too shutdown by itself the controller will factory reset.
Turn off any anti virus software and...
No, the indicators are full, but the battery on the RC screen shows 60%, when I turned it off it showed 85%. I will try to use it all the way and then charge it again and then try to update the firmware, but before that I will test once again at...
Are these antennas directional? Does the signal drop significantly when the drone is behind me? I ask because I mainly operate the drone in a car (mainly because I have a better view of the camera image).
They are omnidirectional.
Thats going to be a problem....You gotta get out of the car really for it to work well, any antenna will have a problem there.