iPadOS 12.1.1 (build 16C50) is an official Apple over-the-air update for the iPad Pro 12.9-inch (Cellular), released on 2018-12-05T18:09:13Z. The update package is 1.25 GB. This is a delta (partial) update that requires 11.3.1 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 5e00c3f3820c46d831c988430488f78754c389f9.zip.