iPadOS 9.2.1 (build 13D15) is an official Apple over-the-air update for the iPad 4 (Global), released on 2016-01-19T17:59:18Z. The update package is 926.79 MB. This is a delta (partial) update that requires 8.4 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: a721815c8005fba9f116cd7be9aa89b50407807c.zip.