iPadOS 12.1 (build 16B5077c) is an official Apple over-the-air update for the iPad Pro 12.9-inch (Cellular), released on 2018-10-09T17:05:33Z. The update package is 357.23 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: 1069d264384a055c3cc6bf6ff55eec0fee9ad311.zip.