iPadOS 11.2.1 (build 15C153) is an official Apple over-the-air update for the iPad Pro (10.5-inch, WiFi), released on 2017-12-13T18:10:28Z. The update package is 1.17 GB. This is a delta (partial) update that requires 10.3.3 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 4f7352e9cae4e9d3186a1f4d9e0ac4f236ccb533.zip.