iPadOS 11.4 (build 15F5079a) is an official Apple over-the-air update for the iPad Pro 9.7-inch (WiFi), released on 2018-05-17T17:02:07Z. The update package is 252.76 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: e27f74f0fede5a77aeb344d2774ff45c15a973d3.zip.