iPadOS 12.3 (build 16F5139e) is an official Apple over-the-air update for the iPad Pro 3 (12.9-inch, Cellular, 1TB Model), released on 2019-04-22T17:08:41Z. The update package is 470.91 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: ff6cb14a66b8b68a4522666c30a90d60f77e4e29.zip.