iPadOS 12.1.1 (build 16C50) is an official Apple over-the-air update for the iPad Pro 9.7-inch (Cellular), released on 2018-12-05T18:08:59Z. The update package is 372.43 MB. This is a delta (partial) update that requires 12.0 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: acf294af0cdd3a97f44ee347a268b7b0b59fd4ee.zip.