iPadOS 9.2.1 (build 13D15) is an official Apple over-the-air update for the iPad mini 3 (WiFi), released on 2016-01-19T17:59:32Z. The update package is 1.12 GB. This is a delta (partial) update that requires 8.1.3 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 595b8947fd1ae34d5bc05baddd0ffc4220a0eae1.zip.