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 247.65 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: 5bc3953e12ffd91fb865388b7c4ff8666805f468.zip.