iPadOS 11.4 (build 15F5037c) is an official Apple over-the-air update for the iPad mini 3 (WiFi), released on 2018-04-02T17:06:28Z. The update package is 248.49 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: 0c5e6f729c12ea5917a21df80249a0f6d833239b.zip.