iPadOS 11.4.1 (build 15G5054c) is an official Apple over-the-air update for the iPad Pro 12.9-inch (WiFi), released on 2018-05-30T17:04:53Z. The update package is 194.56 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: 39b237b303b2ba85bc10fdce28237485a7e920bc.zip.