Suddenly all cameras and flashlight cant be opened.
It said cant found the camera
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I would try testing the cameras individually via the Hardware Test Menu (CIT) available on Xiaomi phones. Here's a guide you can follow. This diagnostics tool will allow you to isolate if it's a single camera, the flash, or the whole assembly (which I'm not familiar with a teardown of the device).
Once you isolate the hardware components, you can ensure everything is plugged in and seated correctly. Additionally, check for any corrosion or signs of a short. If everything looks clean, I would replace the problematic part(s) and see if you can resolve the issue. Otherwise, you may be looking at a motherboard failure.
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Has the phone been dropped or been in contact with water recently, or anything else that could have broken something. The camera unit could be broken or have a loose connection.
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