iPadOS 12.1.1 (build 16C50) is an official Apple over-the-air update for the iPad Pro 3 (12.9-inch, WiFi, 1TB Model), released on 2018-12-05T18:09:42Z. The update package is 352.02 MB. This is a delta (partial) update that requires 12.1 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 46378974f6d8e37b2ca831cde38c5476b6b8599e.zip.