iPadOS 11.4 (build 15F5077a) is an official Apple over-the-air update for the iPad mini 2 (China), released on 2018-05-14T17:16:47Z. The update package is 222.81 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: ac550080764a39b8db3ce4d0d0bf54019dcc0d27.zip.