iPhone 12 Pro Max shows Unknown part in display

It appears that your iPhone thinks that its display (the screen) has been replaced with an unauthorised one. If you have had the screen replaced, was it done by an authorised Apple repairer?

This link may help you find an authorised service agent in your area:

Find Locations - Apple

Parts and service history

With iOS 15.2 and later and iPhone XR, iPhone XS models, and later—including iPhone SE (2nd and 3rd generation)—you can go to Settings > General > About for the parts and service history of your iPhone. You can also find out if the battery has been replaced. If the replacement was done using genuine Apple parts and processes, "Genuine Apple Part" will appear next to Battery.

oluwaseun70 wrote:

but It doesn’t show if it is ,battery or Camera ,

It means the display which is the screen of your phone. If it was the battery, it would say “Battery”. If it was the camera, it would say “Camera”.

It IS saying screen. Your 'display’ is your screen.

The display is unknown, it clearly says in the picture posted by you.

oluwaseun70 wrote:

So it won’t say if it is screen

”Display” means “screen”. The words mean the same thing in this context.