iPadOS 11.1 (build 15B5078e) is an official Apple over-the-air update for the iPad Air 2 (WiFi), released on 2017-10-09T17:02:04Z. The update package is 122.7 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: c47ebc9787c09e5ff16d5c9152c9eb36f07a59cb.zip.