iPadOS 11.4.1 (build 15G77) is an official Apple over-the-air update for the iPad Air (WiFi), released on 2018-07-09T17:06:47Z. The update package is 587.15 MB. This is a delta (partial) update that requires 11.2 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 4505e99710ace494f712e69beb967becc5d64867.zip.