iPadOS 11.3.1 (build 15E302) is an official Apple over-the-air update for the iPad mini 3 (WiFi), released on 2018-04-24T17:06:28Z. The update package is 704.55 MB. This is a delta (partial) update that requires 11.1.2 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 5e67015e9bb81935edb3ae883bf5c007c1e51a96.zip.