iPadOS 9.2.1 (build 13D15) is an official Apple over-the-air update for the iPad Air 2 (Cellular), released on 2016-01-19T17:59:39Z. The update package is 34.8 MB. This is a delta (partial) update that requires 9.2.1 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: b0ea11fc4041f893df2b87728c7f91ae15ffba61.zip.