iPadOS 12.1.3 (build 16D39) is an official Apple over-the-air update for the iPad Air (China), released on 2019-01-22T18:04:11Z. The update package is 1.23 GB. This is a delta (partial) update that requires 11.0.1 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 7c94e1aa6bfa8442baf2e33d0135d494961c3cfd.zip.