iPadOS 11.4 (build 15F5049c) is an official Apple over-the-air update for the iPad 5 (WiFi), released on 2018-04-16T17:07:43Z. The update package is 258.51 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: 338243ca92fef52c192f93099d8096f7dfcf8bea.zip.