iPadOS 11.2.1 (build 15C153) is an official Apple over-the-air update for the iPad Pro 9.7-inch (Cellular), released on 2017-12-13T18:09:32Z. The update package is 490.5 MB. This is a delta (partial) update that requires 11.0.2 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 79d3286585fc6f3c88aa4e6a3d19255e54a5b787.zip.