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 2019-04-08T17:04:42Z. The update package is 382.85 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: f40ed6a3684da6b851e36390bc39b2c9e76c8f71.zip.