iPadOS 11.1.1 (build 15B150) is an official Apple over-the-air update for the iPad Air (China), released on 2017-11-09T18:04:23Z. The update package is 159.58 MB. This is a delta (partial) update that requires 11.0 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: d83c692d6d75f463ec643d683a56a238c39fc13b.zip.