iPadOS 11.4 (build 15F79) is an official Apple over-the-air update for the iPad mini 3 (China), released on 2018-05-29T17:14:02Z. The update package is 616.1 MB. This is a delta (partial) update that requires 11.2.1 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 33b991e88db614ed65b76d4018c48faa2ab280b4.zip.