Face ID is a face recognition technology designed by Apple for its full-screen mobile phones (iPhone X and above) to replace the Touch ID function of the original models. How does Face ID work?

Face ID uses a "TrueDepth camera system", which consists of sensors, cameras, and a dot projector at the top of the iPhone display in the notch to create a detailed 3D map of your face. Every time you look at your phone, the system conducts a secure authentication check, enabling your device to be unlocked or your payment to be authorised quickly and intuitively if it recognises you.

However, Face ID is easy to be damaged for some reasons, such as falling, water ingress or improper operation during maintenance, which may cause Face ID to fail and cause inconvenience to us. At this time, we have to find a way to fix Face ID. Today we're going to fix the disabled Face ID of an iPhone 12 Pro Max due to water ingress. Watch the video for details.