iPadOS 11.1.2 (build 15B202) is an official Apple over-the-air update for the iPad Air (China), released on 2017-11-16T21:15:19Z. The update package is 36 MB. This is a delta (partial) update that requires 11.1 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: f244fa774d38f630560275d67118ee09f86ce36b.zip.