iPadOS 11.1.2 (build 15B202) is an official Apple over-the-air update for the iPad Air (China), released on 2017-11-16T21:15:13Z. The update package is 1016.36 MB. This is a delta (partial) update that requires 10.3.3 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: da8ae003496e31ea133e471556c1da491ce91671.zip.