iPadOS 12.4 (build 16G5077a) is an official Apple over-the-air update for the iPad Air (China), released on 2019-07-16T17:38:57Z. The update package is 115.94 MB. This is a delta (partial) update that requires 12.4 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 949b08a3dc7ce42bd66359c64c1bdc1ee208397a.zip.