iPadOS 11.2.1 (build 15C153) is an official Apple over-the-air update for the iPad Pro 12.9-inch (WiFi), released on 2017-12-13T18:09:47Z. The update package is 1.14 GB. This is a delta (partial) update that requires 10.3 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: c6d495a49938c7bdd2fd6e9c28eec5f059139c29.zip.