Meizu mx4 pro back camera problem, help

Hi! Can someone help me please. The front camera is working but the back camera is not, I bought a new back camera but it does not work with it either. What could the problem be? Can somebody help me?

Meizu m3s

Maybe it is not the camera’s problem, it might be the motherboard. What cause the camera to stop working?

Do you know where can we find a motherboard?

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