Xiaomi k4O rear camera black screen

1. Check whether the camera is blocked.

2. If you use a third-party camera software, it is recommended to take photos with its own camera function to see if there is a black screen.

3. Reset the camera parameters, set the gear icon, set and reset the camera.

4. Turn off the phone and restart it.

5. If you still can't take photos normally, it is recommended to back up data contacts, text messages, photos, etc. And try to restore the factory settings.