iPadOS 11.4 (build 15F5037c) is an official Apple over-the-air update for the iPad Air 2 (WiFi), released on 2018-04-02T17:06:32Z. The update package is 249.08 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: 22e7bd3d4bc3475b9028f6018785b92aa57e51b1.zip.