iPadOS 11.4 (build 15F5077a) is an official Apple over-the-air update for the iPad mini 4 (Cellular), released on 2018-05-14T17:16:57Z. The update package is 247.31 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: 8923efbe15ae6e4fd2cfacbf178b7aa963b41146.zip.