iPadOS 11.1 (build 15B93) is an official Apple over-the-air update for the iPad Air 2 (WiFi), released on 2017-10-23T17:04:27Z. The update package is 164.16 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: 21cdafcbaefb7ebf0a60304d536e9a385a21204b.zip.