iPadOS 12.3 (build 16F5129d) is an official Apple over-the-air update for the iPad Pro 3 (12.9-inch, WiFi, 1TB Model), released on 2019-04-08T17:04:43Z. The update package is 321.52 MB. This is a delta (partial) update that requires 12.3 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 4dfd894fd2a547fc10d7c8201863cc4f8fe8a38f.zip.