iPadOS 11.4.1 (build 15G5054c) is an official Apple over-the-air update for the iPad Air (WiFi), released on 2018-05-30T17:04:39Z. The update package is 186.39 MB. This is a delta (partial) update that requires 11.4 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 48629ebf04175575dcad715e2d3dc5fa0eb5e766.zip.