iPadOS 11.3.1 (build 15E302) is an official Apple over-the-air update for the iPad mini 3 (WiFi), released on 2018-04-24T17:06:27Z. The update package is 1.23 GB. This is a delta (partial) update that requires 10.3.3 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 8bc57ab4a68a2ba033c61cc4a969d3befca79a9a.zip.