iPadOS 11.3.1 (build 15E302) is an official Apple over-the-air update for the iPad mini 3 (China), released on 2018-04-24T17:07:01Z. The update package is 607.82 MB. This is a delta (partial) update that requires 11.2.6 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 874ca9612846394cb70ac63075c8cb3272b244dc.zip.