iPadOS 12.1.1 (build 16C50) is an official Apple over-the-air update for the iPad Air (China), released on 2018-12-05T18:07:22Z. The update package is 350.81 MB. This is a delta (partial) update that requires 12.0.1 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: c5f2c9b4ad9fe518792d1e41a14bdb945a6c996c.zip.