I have a phantom 4. Installed  a gimbal gaurd. This thing is uncontrollable.  Removed it and its ok. Installed the latest firmware. Imu calibration,  and compass calibration. Watched a video on YouTube  with the same one i bought. It appears that you can't  use one. Will I ever to be able to.

Hello Ron, it has been advised here in the forum that we should not install a gimbal guard on the p4. Maybe until dji would come up with their design. Happy flying!

Hans

Hello ronspickler, basically it is not recommended to use any 3rd-party gimbal protectors. Read it here:
http://forum.dji.com/thread-53496-1-1.html