iPadOS 12.1 (build 16B5089b) is an official Apple over-the-air update for the iPad Air 2 (Cellular), released on 2018-10-22T17:01:33Z. The update package is 133.54 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: d17e183e9652ac2570e97c89041d9dba16988080.zip.