I started my Matrice 600 this morning and DJI GO app had locked the UAV from flight. I have a Z15-GH4 Gimbal and a Panasonic Lumix GH4 camera.
It then stated that firmware update is required. I cant find any firmware update on the DJI we site related to the Gimbal, and not sure why it has to be added to the camera SD card. Anyone know what firmware i need and where to get it?

Could you please verify what firmware versions are currently on both the M600 and GH4? In addition, what mobile device and Go app version are you running?