iPadOS 12.3 (build 16F5139e) is an official Apple over-the-air update for the iPad Pro 12.9-inch (Cellular), released on 2019-04-22T17:08:16Z. The update package is 271.12 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: e5c80027ada47f042288991960a4d115b3f09815.zip.