Did they change the camera module or motherboard? Is it software or hardware issue? And did you sent ur mobile to UAE or got warranty repair in India. Pls provide full detail or story. I'm in same both as you.
Hello same problem! My front camera is working. When switching to rear camera, it shows black screen. Disabling rear main camera in GCam helps utrawide camera to work. Main camera and telephoto lens doesn't work.