iPadOS 9.2.1 (build 13D15) is an official Apple over-the-air update for the iPad Air (China), released on 2016-01-19T17:59:25Z. The update package is 303.28 MB. This is a delta (partial) update that requires 9.0 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 804db4916a5429e8813fcc87dc7f7e0cfcd8aed0.zip.