iPadOS 11.4 (build 15F5049c) is an official Apple over-the-air update for the iPad Air 2 (WiFi), released on 2018-04-16T17:07:41Z. The update package is 212.94 MB. This is a delta (partial) update that requires 11.4 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: a8fcc3376b49e45b4fd0fcd7468d8999b88f9631.zip.