iPadOS 11.3.1 (build 15E302) is an official Apple over-the-air update for the iPad mini 3 (China), released on 2018-04-24T17:07:00Z. The update package is 614.47 MB. This is a delta (partial) update that requires 11.2.2 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: e76d7ebe40cda0dabae8737aa9915f748929de4a.zip.