iPadOS 11.3 (build 15E216) is an official Apple over-the-air update for the iPad Pro 12.9-inch (Cellular), released on 2018-03-29T17:10:53Z. The update package is 709.62 MB. This is a delta (partial) update that requires 11.0 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 418126785f417c304b341710c1a7c019817b2585.zip.