iPadOS 12.3 (build 16F5155a) is an official Apple over-the-air update for the iPad Pro 3 (11-inch, Cellular, 1TB Model), released on 2019-05-07T17:04:03Z. The update package is 84.26 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: d801b2f23df905efb9a453b33a32475779e2ce37.zip.