iPadOS 10.3.1 (build 14E304) is an official Apple over-the-air update for the iPad mini 4 (WiFi), released on 2017-04-03T17:00:07Z. The update package is 733.76 MB. This is a delta (partial) update that requires 10.0.1 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 5b388e5437d5c31a557bb8279891f3f4a762ddba.zip.