iPadOS 11.4 (build 15F79) is an official Apple over-the-air update for the iPad Air 2 (Cellular), released on 2018-05-29T17:14:32Z. The update package is 616.68 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: 55306714a045447602704a2b4258ecd9af972dc4.zip.