Default [HELP][i9505] Rear Camera failure

I have a i9505 and it was on 4.2.2 the camera was working fine then I update it to 4.3 and got a camera firmware update from the camera app after this the back camera didn't work every time, so finally I update to 4.4.2 and the back camera is not working at all.

I want to try something like changing the camera fw but not rooting or changing the fw unless it's a stock one