iPadOS 12.1.1 (build 16C5036c) is an official Apple over-the-air update for the iPad Air 2 (Cellular), released on 2018-10-31T17:03:42Z. The update package is 285 MB. This is a delta (partial) update that requires 12.1 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 9b57bfdd97650c3eeb639dcc838278a0444986a3.zip.