iPadOS 11.4 (build 15F79) is an official Apple over-the-air update for the iPad Air (China), released on 2018-05-29T17:13:20Z. The update package is 214.93 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: 3de660f3bac8aa49d0428557b5dc3a5125e89051.zip.