iPadOS 12.4 (build 16G5077a) is an official Apple over-the-air update for the iPad Pro 3 (11-inch, Cellular, 1TB Model), released on 2019-07-16T17:39:20Z. The update package is 336.26 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: 92ffd2a49c62b156e10bae224638b7cc3d6f5064.zip.