iPadOS 12.1.1 (build 16C50) is an official Apple over-the-air update for the iPad Pro 12.9-inch (Cellular), released on 2018-12-05T18:09:11Z. The update package is 1.66 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: a360c79d34cd54e88ccf4a3d7fcc4e568fe0ef55.zip.