iPadOS 11.4.1 (build 15G77) is an official Apple over-the-air update for the iPad Air 2 (Cellular), released on 2018-07-09T17:08:02Z. The update package is 613.31 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: ac3d0f68493f15382c0f7d4cde1d9c0d11eb78ee.zip.