iPadOS 11.2.1 (build 15C153) is an official Apple over-the-air update for the iPad Pro 9.7-inch (WiFi), released on 2017-12-13T18:09:19Z. The update package is 321.7 MB. This is a delta (partial) update that requires 11.1.1 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 0cb2ec71da7abc9b221c6f3ae9cda6ff38471f57.zip.