iPadOS 11.4 (build 15F79) is an official Apple over-the-air update for the iPad Air 2 (WiFi), released on 2018-05-29T17:14:26Z. The update package is 616.73 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: d2b4f05ed6910615e3d8989efd9a606950c6a879.zip.