iPadOS 9.2.1 (build 13D15) is an official Apple over-the-air update for the iPad 4 (GSM), released on 2016-01-19T17:59:16Z. The update package is 27.44 MB. This is a delta (partial) update that requires 9.2 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 5236fca712dc136ffdc8dd63fe938cac253b1df7.zip.