Hello, I'm having quite a few problems with the 3.14 firmware update after over a year operating my Phantom 2 without a problem.

The main issue is that the gimball control from the controller has stopped working. The gimball stabilizes the camera but not allowing any other movement than 90 degrees forward. Re-callibrating the RC doesn't work and the gimball is shown as "OFF" at the Phantom 2 update manager, with no option to switch it back to ON.
It seems like the most used option is firmware downgrading but any of DJI's actual update managers doesn't allow it.

The other problem came with the batteries, they show full charge on the led indicators but battery level was actually below 15%. The problem is that while showing a full charge, it doesn't allow it to keep charging, don't now if it could've something to do with the firmware as well or not.

So any help about any of these issues, or with the firmware downgrade would be very much appreciated.

Thanks

Try doing a manual calibration. Follow the steps exactly.