How to open camera
Unknown Part Unable to determine if your iPhone camera is a genuine Apple part. This could be because the part is non-genuine, not functioning as expected, or the installation is incomplete
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uttam6891 wrote:
Unknown Part Unable to determine if your iPhone camera is a genuine Apple part. This could be because the part is non-genuine, not functioning as expected, or the installation is incomple
You will see an Unknown Part 
message if the camera installation is incomplete or if the camera:
- Was replaced with a nongenuine camera
- Was already used or installed in another iPhone
- Isn't functioning as expected
This message doesn't affect your ability to use your iPhone or access your camera.
Learn more about iPhone parts and service history.
iPhone Repair and Service - Apple Support
iPhone Repair - Official Apple Support