iPadOS 13.4 (build 17E5223h) is an official Apple over-the-air update for the iPad Pro 3 (12.9-inch, Cellular), released on 2020-02-05T18:17:20Z. The update package is 781.86 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: bd22ce76b022fbb390539d0916cf9b1d8b3c388f.zip.