iPadOS 12.3 (build 16F5117h) is an official Apple over-the-air update for the iPad Pro 3 (12.9-inch, Cellular, 1TB Model), released on 2019-03-27T17:06:17Z. The update package is 334.14 MB. This is a delta (partial) update that requires 12.2 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: f09b5c6891ad490a9c978804577753d1e47283c1.zip.