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 35.39 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: abfd0502eb33d5d2a42c70ac5f6cf0d693d97c86.zip.