iPadOS 9.2.1 (build 13D15) is an official Apple over-the-air update for the iPad mini 4 (WiFi), released on 2016-01-19T17:59:35Z. The update package is 291.45 MB. This is a delta (partial) update that requires 9.0 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 4146abf69deca18826501358b57bd3467740070f.zip.