iPadOS 11.4 (build 15F5049c) is an official Apple over-the-air update for the iPad Pro 12.9-inch (Cellular), released on 2018-04-16T17:07:54Z. The update package is 189.64 MB. This is a delta (partial) update that requires 11.4 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 47ac33bbba5d742fd19bf875164ca52d9ffec07f.zip.