iPadOS 9.2.1 (build 13D15) is an official Apple over-the-air update for the iPad mini 3 (Cellular), released on 2016-01-19T17:59:33Z. The update package is 1.14 GB. This is a delta (partial) update that requires 8.1.1 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 6c09985438a19eb4e4768e6454a6bb033ecf1953.zip.