iPadOS 11.3 (build 15E216) is an official Apple over-the-air update for the iPad Pro 9.7-inch (Cellular), released on 2018-03-29T17:10:35Z. The update package is 1.24 GB. This is a delta (partial) update that requires 10.3.2 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: c0e1f14bba316f47bbcad6f9f19adcfd32486233.zip.