iPadOS 11.3.1 (build 15E302) is an official Apple over-the-air update for the iPad mini 2 (China), released on 2018-04-24T17:06:18Z. The update package is 703.89 MB. This is a delta (partial) update that requires 11.0.2 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: e1624a5caeec9a9f7d203ba1bf4dfa0198ff085b.zip.