iPadOS 13.1 (build 17A5831c) is an official Apple over-the-air update for the iPad Pro 3 (12.9-inch, Cellular), released on 2019-09-04T17:06:06Z. The update package is 537.47 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: 590f09688415448edab8fa9476e5157338f28d31.zip.