iPadOS 8.4 (build 12H143) is an official Apple over-the-air update for the iPad Air (China), released on 2015-06-30T15:51:13Z. The update package is 423.08 MB. This is a delta (partial) update that requires 8.1.2 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: ca361981cc185974568b4cb2f78c6b6822b57c35.zip.