iPhone camera suddenly states it’s an unknown part
Camera stopped working. Restarted phone and now settings say camera is an unknown part
iPhone 12 Pro Max, iOS 15
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Perhaps an official Apple iPhone authorized service center would suffice
to have a defective iPhone further inspected, to see what has happened.
Above article has 'Get Service' link within.
Get started with camera service.
If not, that article appears above this discussion; likely you'd seen & read it.
(Depending on your location globally, you may have options; not sure what.)
The main portal for iPhone Repair is this official page:
• iPhone Repair - Official Apple Support
//support.apple.com/iphone/repair/service