iPadOS 12.1.3 (build 16D5037a) is an official Apple over-the-air update for the iPad Air (China), released on 2019-01-07T18:06:19Z. The update package is 65.22 MB. This is a delta (partial) update that requires 12.1.3 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: adbfe4f43304613f8acdb4716783e0dc4af4d7aa.zip.