iPadOS 11.4 (build 15F5037c) is an official Apple over-the-air update for the iPad mini 2 (WiFi), released on 2018-04-02T17:06:25Z. The update package is 226.01 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: b22af9086b088ac5325fa89ac93967e9acf11178.zip.