iPadOS 12.1.1 (build 16C50) is an official Apple over-the-air update for the iPad Pro 12.9-inch (Cellular), released on 2018-12-05T18:09:12Z. The update package is 1.3 GB. This is a delta (partial) update that requires 11.1 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: b1e2fc92b2233289d06b3fc7e8300d51ddbea847.zip.