iPadOS 9.1 (build 13B5119e) is an official Apple over-the-air update for the iPad Pro 12.9-inch (Cellular), released on 2015-09-23T17:55:08Z. The update package is 182.58 MB. This is a delta (partial) update that requires 9.1 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 99e3852788f5927349eed3588dd1e8d6d605743b.zip.