iPadOS 12.1.1 (build 16C50) is an official Apple over-the-air update for the iPad Pro 12.9-inch (Cellular), released on 2018-12-05T18:09:10Z. The update package is 1.68 GB. This is a delta (partial) update that requires 10.1 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 7892acb5bfb0a726710e9fdac079c8c7d81189ef.zip.