iPadOS 11.3.1 (build 15E302) is an official Apple over-the-air update for the iPad mini 3 (China), released on 2018-04-24T17:07:02Z. The update package is 30.83 MB. This is a delta (partial) update that requires 11.3 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 8411d16dd47e9d02fc75bcd06f2e0b9e74d413f2.zip.