iPadOS 11.4 (build 15F79) is an official Apple over-the-air update for the iPad 6 (WiFi), released on 2018-05-29T17:15:35Z. The update package is 286.23 MB. This is a delta (partial) update that requires 11.3 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: c5932afbf09dd19b50f8403687b441074e3f9961.zip.