iPadOS 9.9.12.1 (build 16B5077c) is an official Apple over-the-air update for the iPad Pro 12.9-inch (Cellular), released on 2018-10-09T17:05:33Z. The update package is 2.07 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: 51f5c59030b5ee09c9f3a41b1db9d0873872e388.zip.