iPadOS 12.1.1 (build 16C50) is an official Apple over-the-air update for the iPad Air (China), released on 2018-12-05T18:07:20Z. The update package is 1.19 GB. This is a delta (partial) update that requires 11.2.6 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 577dfe860f519be845d5f64cdc1e41bcf4afb0ba.zip.