iPadOS 12.1 (build 16B92) is an official Apple over-the-air update for the iPad Air 2 (Cellular), released on 2018-10-30T17:06:03Z. The update package is 1.18 GB. This is a delta (partial) update that requires 11.3 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: f45ec968479de2d9fa78fc200230f437e8d9c043.zip.