iPadOS 11.4 (build 15F79) is an official Apple over-the-air update for the iPad mini 2 (Cellular), released on 2018-05-29T17:13:33Z. The update package is 214.91 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: 509db6a910cdf65d8c31dd8e14b345df0f4d592c.zip.