iPadOS 11.1 (build 15B5086a) is an official Apple over-the-air update for the iPad Air (Cellular), released on 2017-10-16T17:03:52Z. The update package is 83.66 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: fd02b14f2f3d0305e896ecf4e7eb1ae20010d886.zip.