iPadOS 9.1 (build 13B5143) is an official Apple over-the-air update for the iPad Pro 12.9-inch (WiFi), released on 2015-10-21T17:15:46Z. The update package is 1.45 GB. This is a full OTA update that can be applied from any compatible base version. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: a83a1aeeaf99fc02736b70e9b1a045ed9c74df2c.zip.