iPadOS 11.4 (build 15F5049c) is an official Apple over-the-air update for the iPad Air 2 (WiFi), released on 2018-04-16T17:07:40Z. The update package is 216.97 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: 613eb3b47e5b1e253b10acba1efb1d0e240c5ce9.zip.