Why not older 10.2” iPads?

FaceID requires specific hardware not found on iPad models that feature TouchID. Similarly, the TouchID sensor is not fitted to iPad models that have FaceID.

FaceID uses a camera and sensor array consisting of three Infrared modules - these being a IR Flood Illuminator, IR Dot Projector and and IR Camera - these being independent of the front visible-light camera.

Being hardware dependent, FaceID cannot be simply added with a software update.

These iPad models do not have the Face ID camera hardware needed.

Sorry.