iPadOS 12.4 (build 16G5056d) is an official Apple over-the-air update for the iPad Pro 3 (11-inch, Cellular, 1TB Model), released on 2019-06-24T17:17:14Z. The update package is 340.9 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: 33bc78698a4960b3b39148ed973894f59cf761bf.zip.