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 1.06 GB. This is a delta (partial) update that requires 8.4.1 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 2486ceac66418c52a156e7dcbf264910ff205c07.zip.