iPadOS 12.4 (build 16G5056d) is an official Apple over-the-air update for the iPad Pro 3 (12.9-inch, Cellular), released on 2019-06-24T17:17:18Z. The update package is 222.1 MB. This is a delta (partial) update that requires 12.4 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: f018d4325b26182a45036b6a931b752ccc50a3fd.zip.