iPadOS 11.4 (build 15F5079a) is an official Apple over-the-air update for the iPad Air 2 (WiFi), released on 2018-05-17T17:02:02Z. The update package is 247.33 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: 572de9b1b2f392df89a580442231fcf6d31964bc.zip.