iPadOS 11.4 (build 15F5071a) is an official Apple over-the-air update for the iPad Pro 12.9-inch (WiFi), released on 2018-05-07T17:11:19Z. The update package is 248.38 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: efa69610701169221478928a2ed64425cd08897e.zip.