iPadOS 11.4 (build 15F5079a) is an official Apple over-the-air update for the iPad Air 2 (Cellular), released on 2018-05-17T17:02:03Z. The update package is 247.6 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: b626fe6b5561bd2e032f286b62ad656516e2e56b.zip.