iPadOS 12.1.1 (build 16C50) is an official Apple over-the-air update for the iPad Air (China), released on 2018-12-05T18:07:19Z. The update package is 1.55 GB. This is a delta (partial) update that requires 10.3.3 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 42dabd8d140461609bfe1873b6dd0859fed3f598.zip.