iPadOS 11.4 (build 15F5077a) is an official Apple over-the-air update for the iPad 5 (Cellular), released on 2018-05-14T17:17:00Z. The update package is 292.54 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: c7640bf24f6826486f9e37cb0e0eb623843c951a.zip.