Apple's products have shown themselves as resistant to teardowns and re-assembly in the past. The Australian device-repair YouTuber Hugh Jeffreys has posted a new video that seems to demonstrate that this is also true of the recently-launched iPhone 12. The device's UI and cameras exhibited anomalies in response to a motherboard switch.
https://www.notebookcheck.net/The-iPhone-12-proves-extremely-repair-unfriendly-in-a-new-video.501402.0.html