iPadOS 11.2.1 (build 15C153) is an official Apple over-the-air update for the iPad Pro 9.7-inch (WiFi), released on 2017-12-13T18:09:02Z. The update package is 1.08 GB. This is a delta (partial) update that requires 10.0.1 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 589414a0675f323d7b5fbbd67a42bb389ff61534.zip.