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 612.78 MB. This is a delta (partial) update that requires 11.2.6 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 7aa8dde08163603ad92ade9b03eb9b7c56b3ed12.zip.