iPadOS 13.1 (build 17A5831c) is an official Apple over-the-air update for the iPad Pro 12.9-inch (WiFi), released on 2019-09-04T17:05:43Z. The update package is 494.73 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: 612ec37dab080d68af403bcfc4f890c629b84f0b.zip.