What is the reason why Xiaomi 6x camera can't be reversed?

The software and mobile phone camera are broken.

Software problem, clear data opening settings in software settings, click application settings, select application management, find camera program, click clear data, and then restart.

The camera cable on the back of the mobile phone is loose or has poor contact. After the phone is turned off, press and hold the camera with your finger to turn it on.

The phone camera is broken. It is recommended to back up the mobile phone data and go to a professional mobile phone after-sales maintenance service center for inspection and maintenance.