iPadOS 13.5 (build 17F5065a) is an official Apple over-the-air update for the iPad Pro 4 (12.9-inch, WiFi), released on 2020-05-06T17:08:36Z. The update package is 150.67 MB. This is a delta (partial) update that requires 13.5 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 154544794c7c7c8d7501acde347656018b327b3c.zip.