iPadOS 11.4 (build 15F5061d) is an official Apple over-the-air update for the iPad Air 2 (WiFi), released on 2018-05-01T17:05:45Z. The update package is 212.27 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: efbbed62facdf455cccf62b7f937e8ec4d680d8f.zip.