iPadOS 11.3.1 (build 15E302) is an official Apple over-the-air update for the iPad mini 2 (China), released on 2018-04-24T17:06:15Z. The update package is 1.24 GB. This is a delta (partial) update that requires 10.0.1 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: d9dc93ddddb8159649178a328133183071bd8314.zip.