iPadOS 12.1.1 (build 16C50) is an official Apple over-the-air update for the iPad Pro 3 (11-inch, Cellular), released on 2018-12-05T18:09:41Z. The update package is 356.26 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: 42e31bbe63cb002b723338b247bcee585d730001.zip.