iPadOS 11.4.1 (build 15G77) is an official Apple over-the-air update for the iPad Air (Cellular), released on 2018-07-09T17:06:52Z. The update package is 582.03 MB. This is a delta (partial) update that requires 11.2.6 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 502450fcc34467137e83515684a2a51820de1e5e.zip.