iPadOS 11.3 (build 15E216) is an official Apple over-the-air update for the iPad Pro 9.7-inch (Cellular), released on 2018-03-29T17:10:40Z. The update package is 684.11 MB. This is a delta (partial) update that requires 11.1.1 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 64a23c1674648559f45a70399478cc9d894cab92.zip.