iPadOS 12.1.1 (build 16C50) is an official Apple over-the-air update for the iPad Air 2 (Cellular), released on 2018-12-05T18:08:29Z. The update package is 286.47 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: 328da448320cdcd468ff04a675fb73106788a5cf.zip.