iPadOS 13.4 (build 17E5249a) is an official Apple over-the-air update for the iPad Pro 3 (12.9-inch, Cellular), released on 2020-03-03T18:20:04Z. The update package is 824.17 MB. This is a delta (partial) update that requires 13.3.1 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 8bd9501bf8b00e72096fbb053ecb194e1387a10c.zip.