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 159.11 MB. This is a delta (partial) update that requires 11.0.1 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 127d6bebb7204c47b2badd6007406ecd8a577e93.zip.