iPadOS 12.3 (build 16F5139e) is an official Apple over-the-air update for the iPad Pro 12.9-inch (Cellular), released on 2019-04-22T17:08:15Z. The update package is 364.79 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: e925c88073f053c15fc0f7a0261ce1f5608b89d8.zip.