iPadOS 12.1 (build 16B92) is an official Apple over-the-air update for the iPad Air (China), released on 2018-10-30T17:04:46Z. The update package is 1.16 GB. This is a delta (partial) update that requires 11.4 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 5eefaa8f8bb90e6f58ef84c4c23d8b30a9e6f99e.zip.