iPadOS 12.4 (build 16G5069a) is an official Apple over-the-air update for the iPad Pro 3 (12.9-inch, Cellular, 1TB Model), released on 2019-07-09T17:16:15Z. The update package is 336.03 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: e064ff74721e7e19b9dd0a18a34e9c1e656bd85d.zip.