iPadOS 11.4 (build 15F5071a) is an official Apple over-the-air update for the iPad 5 (Cellular), released on 2018-05-07T17:11:14Z. The update package is 292.25 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: bf6baa2e39ea041d6ec423d5e57f2f45a009814b.zip.