iPadOS 9.2.1 (build 13D15) is an official Apple over-the-air update for the iPad 4 (Global), released on 2016-01-19T17:59:19Z. The update package is 23.99 MB. This is a delta (partial) update that requires 9.2.1 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 4ae3904581af0e28125479881c93da2a4176d058.zip.