iPadOS 9.2.1 (build 13D15) is an official Apple over-the-air update for the iPad mini 3 (Cellular), released on 2016-01-19T17:59:34Z. The update package is 238.07 MB. This is a delta (partial) update that requires 9.1 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 30f399690f1dae28f5c93d6d4b0a25999749be29.zip.