iPadOS 11.4.1 (build 15G5072a) is an official Apple over-the-air update for the iPad Air (Cellular), released on 2018-06-18T17:05:22Z. The update package is 148.3 MB. This is a delta (partial) update that requires 11.4.1 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: d92b3cf60ed8bc551006c42cb7ec0eaa721297f4.zip.