iPadOS 12.3 (build 16F5148a) is an official Apple over-the-air update for the iPad Pro 3 (12.9-inch, WiFi, 1TB Model), released on 2019-04-29T17:35:58Z. The update package is 469.26 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: e686e8d6b9c7ac997f1646643c633ef251eaa8fc.zip.