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 34.88 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: 415dd9d230131a0438a04af15394fc3557b7332d.zip.