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 587.11 MB. This is a delta (partial) update that requires 11.2.2 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 28e372429ec19cf6e6de8321a66556e58f40759d.zip.