iPadOS 12.1 (build 16B92) is an official Apple over-the-air update for the iPad Pro 12.9-inch (Cellular), released on 2018-10-30T17:06:58Z. The update package is 392.06 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: e9ee3a792955eab16513537f4d6f7d6823444a31.zip.