iPadOS 12.1 (build 16B5059d) is an official Apple over-the-air update for the iPad Pro 2 (12.9-inch, Cellular), released on 2018-09-18T17:20:13Z. The update package is 354.99 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: c224e34e92018916d24ddbc4566f65f881914483.zip.