iPadOS 9.2.1 (build 13D15) is an official Apple over-the-air update for the iPad Air (WiFi), released on 2016-01-19T17:59:20Z. The update package is 233.58 MB. This is a delta (partial) update that requires 9.1 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: e34e0dbab2c0b7214ca57f91f1ec4cf7a4115613.zip.