iPadOS 13.1 (build 17A5821e) is an official Apple over-the-air update for the iPad Pro 3 (12.9-inch, WiFi, 1TB Model), released on 2019-08-27T17:28:55Z. The update package is 416.84 MB. This is a delta (partial) update that requires 13.0 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 872c70499c9ff17b9d33df6b3acebfe0060a7950.zip.