iPadOS 11.4 (build 15F5077a) is an official Apple over-the-air update for the iPad mini 3 (China), released on 2018-05-14T17:16:55Z. The update package is 246.74 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: 484f87cffa5492f9fe6f25b144931000b436aaa2.zip.