iPadOS 12.1.3 (build 16D5037a) is an official Apple over-the-air update for the iPad Pro 3 (11-inch, Cellular), released on 2019-01-07T18:06:56Z. The update package is 324.69 MB. This is a delta (partial) update that requires 12.1.1 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: c831e8d5ada18d5aae5ea387134dde1829dd38a5.zip.