You may be wondering; "What is iPhone part serialisation?" or "Why does my iPhone have a non genuine part warning message?"

When an iPhone is manufactured, some parts inside are serialised which means that they are are calibrated to the logic-board with a unique identifier.

Due to the serialisation of some parts, the device will recognise when they are replaced and if it is an aftermarket part it will notify the owner with an “Unknown Part" or “Non-Genuine Part” message within the settings menu (and may have a pop-up message on startup). This doesn’t affect the performance or usability of the device, and there is nothing to worry about if your phone has this message on any part(s).

iPhone models and parts that are affected to this include but are not limited to:

Screen: 11, 12, 13, 14, 15, 16 series

Battery: XS, XS Max, XR, 11, 12, 13, 14, 15, 16 series, SE 2nd and 3rd gen

Rear camera: 12, 13, 14, 15, 16 series