iPadOS 13.5 (build 17F5054h) is an official Apple over-the-air update for the iPad Pro 4 (12.9-inch, WiFi), released on 2020-04-29T17:07:00Z. The update package is 213.07 MB. This is a delta (partial) update that requires 13.4.5 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 094d11275e0951beeab4ee5646beafa7bc4a8483.zip.