iPadOS 11.4 (build 15F79) is an official Apple over-the-air update for the iPad mini 2 (China), released on 2018-05-29T17:13:40Z. The update package is 214.79 MB. This is a delta (partial) update that requires 11.3.1 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 9bf0b8ac49c9c1bf7c9ed0f2160997dbc40a1d17.zip.