Why Shouldn’t You Upgrade iOS 11.3
For iPhone 8 users who have changed third-party screen, you’d better not upgrade iOS 11.3.
According to the feedback from many users, the iPhone 8 that have changed the third-party screen is out of working after upgrading iOS 11.3. Just like another problem, if you have changed the third-party battery, the third-party battery can’t work with the function of “Battery Health” after upgrading iOS 11.3.
In fact, these problems once occured in iPhone 7. The main reason is that the specialized Touch ID chips didn’t upgrade after changing third-party screen, and iOS would ban the touch input from iDevices.
In addition, some users said that changing the Ambient Light Sensor or front-camera of iPhone X will make face ID out of working,too.It means that if there is any problem of your new iPhones, you should repair it in AppleCare.