iPadOS 11.3 (build 15E216) is an official Apple over-the-air update for the iPad Pro (10.5-inch, WiFi), released on 2018-03-29T17:11:14Z. The update package is 604.09 MB. This is a delta (partial) update that requires 11.2.2 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 01fdc2ee28da2ec10b709b2c12eb5f0fd62f86c4.zip.