iPadOS 12.1 (build 16B5089b) is an official Apple over-the-air update for the iPad Pro 2 (12.9-inch, WiFi), released on 2018-10-22T17:01:42Z. The update package is 389.11 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: 687b62f8ecf33341ee4157399847ec5c4c137279.zip.