iPadOS 11.4 (build 15F5061d) is an official Apple over-the-air update for the iPad mini 4 (WiFi), released on 2018-05-01T17:05:43Z. The update package is 212.3 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: 1179298c610b05274221cbecc8a8015b7d98ffed.zip.