Hi All
I recently installed a z3 camera on my m600 pro.
I found that I have no video feed but full control of the camera.

Any idea how I can resolve this?

Just to clarify, do you recieve any notification to update firmware? Can you see what firmware you're currently on for the Z3?  If this is your first time setting up a X series camera onto your M600, are you certain that the transmission is set to EXT?