iPadOS 11.4 (build 15F79) is an official Apple over-the-air update for the iPad Pro 12.9-inch (Cellular), released on 2018-05-29T17:15:19Z. The update package is 588.8 MB. This is a delta (partial) update that requires 11.2.6 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 3f327dc5d7cda249878123c997007cb6f5ca0b8d.zip.