iPadOS 11.4 (build 15F5071a) is an official Apple over-the-air update for the iPad Air 2 (Cellular), released on 2018-05-07T17:11:11Z. The update package is 247.58 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: f17a7f93308ec8541b06700cfb9323d757e92d86.zip.