iPadOS 9.3.1 (build 13E238) is an official Apple over-the-air update for the iPad mini 3 (Cellular), released on 2016-03-31T16:53:43Z. The update package is 441.06 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: 8578a5b61f97b3dc99e3e48b1d37cfa85cec257d.zip.