iPadOS 11.4 (build 15F5079a) is an official Apple over-the-air update for the iPad mini 2 (China), released on 2018-05-17T17:01:55Z. The update package is 222.87 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: 03f8a3133a02f359a839c591ffabab54d328f025.zip.