iPadOS 12.1 (build 16B5077c) is an official Apple over-the-air update for the iPad Air (China), released on 2018-10-09T17:05:19Z. The update package is 328.26 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: 1336da4336f08641c3698f8e5d5bfa4e1ccc80ba.zip.