Jay Peters, The Verge:
Soon after the iPhone 13 launched, repair experts found that swapping out iPhone 13 screens would break Face ID unless you also moved over a tiny control chip from the original screen. It’s a complex process that makes one of the most common types of repairs prohibitively difficult for independent repair shops.
More to the point:
Apple-authorized repair shops, on the other hand, have access to a software tool that can make a phone accept a new screen.
So what’s changed?
Apple tells The Verge it will release a software update that doesn’t require you to transfer the microcontroller to keep Face ID working after a screen swap.