iPadOS 12.3 (build 16F5129d) is an official Apple over-the-air update for the iPad Pro 12.9-inch (Cellular), released on 2019-04-08T17:04:25Z. The update package is 275.77 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: c6d8b6032a2da3dfae1b85b91d49721527018341.zip.