iPadOS 11.3 (build 15E216) is an official Apple over-the-air update for the iPad Pro 9.7-inch (Cellular), released on 2018-03-29T17:10:41Z. The update package is 595.04 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: f1362dbc17b37f53b6bf32655e4bacd950db9a17.zip.