iPadOS 11.4 (build 15F5071a) is an official Apple over-the-air update for the iPad 5 (WiFi), released on 2018-05-07T17:11:12Z. The update package is 292.3 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: 4bd7fdc7ab65caa0624b6a6ac77ee81656867597.zip.