iPadOS 9.2.1 (build 13D15) is an official Apple over-the-air update for the iPad mini 3 (China), released on 2016-01-19T17:59:35Z. The update package is 1.05 GB. This is a delta (partial) update that requires 8.4 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 80ad55b080709ee2420876f2b4dd7ad5e25ebaba.zip.