The situation is likely to have serious ramifications for unauthorized fix firms, since they can't service iPhone 8 and X displays despite broken glass being one of the most common smartphone problems.
According to Motherboard, damaged iPhone 8s, which were repaired in a third-party store, failed to respond to touch controls following the installation of the new update.
Most of us have broken at least one smartphone screen, and we know that getting it repaired by the manufacturer isn't cheap. Unless they are an authorized-by-Apple fix provider, however, they can only obtain "after-market" parts, not parts directly from the iPhone manufacturer.
If a different component is detected, it won't work properly.
But why would merely swapping the displays of two identical, working iPhones disable a seemingly unrelated sensor?
Apple's stance towards third-party screen repairs seemed to relax previous year when the company said they wouldn't void an iPhone's warranty so long as they don't damage any other components. The company's decision to reintroduce it with iOS 11.3 is another example of Apple's fundamental hostility to U.S. law on this point.
From the look of things, this was a long time coming, dating all the way back to the iPhone 5s. Each sensor is paired with the iPhone's logic board when the device is manufactured to prevent it from being tampered with. Presumably this was due to the use of unofficial components, but as it turns out it seems that this affects genuine replacement parts as well.
The issue caused controversy when it was first discovered.
"I've been waiting for this for five years to be honest, since the 5S". "It's a scary looking future for me".
Some repairers believe Apple is trying to damage public trust and opening them up to a flood of returns. Many believed Apple was trying to block unauthorized repairers from fixing its devices.
The problem with this is that unauthorized repairs are perfectly legal.
The outcome is that at any stage Apple may break iPhones that have been repaired by third parties via software updates, effectively making its in-store service the only viable option. Getting a cheap iPhone display installed can not void your Apple warranty.
Some may argue (Apple certainly does) that it's in the customer's best interest to only seek repairs from authorised repairers, citing the expertise and longevity.
Apple continues to do its best to design components that third parties can't fix.