How can I change my iPhone display from unknown part to known part?
Please how can I change my iPhone Display from unknown part to a known part
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A message about a non-genuine part is discussed in this support document: iPhone parts and service history - Apple Support
An Unknown Part message appears if the part installation is incomplete or if the part:
Was replaced with a nongenuine part
Was already used or installed in another iPhone
Isn't functioning as expected
More here: About genuine iPhone displays - Apple Support
If the reason isn't immediately apparent, go to this page to find your nearest Apple Authorized Service Provider (AASP) or Apple Authorized Distributor (AAD) --> Find Locations
How to make a Genius Bar appointment
1. Go to Genius Bar Reservation and Apple Support Options - Apple
2. Go to "Get hardware help".
3. Select your hardware and continue selecting options requiring replacing parts until you see "Bring in for Repair"
4. Sign in with your Apple ID