iPadOS 10.3.1 (build 14E304) is an official Apple over-the-air update for the iPad mini 4 (WiFi), released on 2017-04-03T17:00:08Z. The update package is 565.23 MB. This is a delta (partial) update that requires 10.2 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 0ed225f767613129a34339bbb38faedbb2c39df2.zip.