iPadOS 12.3 (build 16F5139e) is an official Apple over-the-air update for the iPad Pro 9.7-inch (Cellular), released on 2019-04-22T17:08:13Z. The update package is 355 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: 225e83f67c25b36d617faf3a6d7dca0ae5c1b503.zip.