iPadOS 9.2.1 (build 13D15) is an official Apple over-the-air update for the iPad mini 4 (Cellular), released on 2016-01-19T17:59:36Z. The update package is 314.06 MB. This is a delta (partial) update that requires 9.0.2 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 62b8550c9482b2e906147aa2a7561e8b9402cfe2.zip.