iPadOS 9.9.11.2.1 (build 15C6153) is an official Apple over-the-air update for the iPad Pro 9.7-inch (Cellular), released on 2017-12-13T18:03:12Z. The update package is 1.72 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: 83d72245276c2d12c914f83d85b0c98432ee5a02.zip.