iPadOS 11.4.1 (build 15G5074a) is an official Apple over-the-air update for the iPad Air (Cellular), released on 2018-06-25T17:06:14Z. The update package is 40.86 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: 40c6672ad1958186aff850fe967eef650bbe4d39.zip.