iPadOS 8.4.1 (build 12H321) is an official Apple over-the-air update for the iPad Air (China), released on 2015-08-13T18:05:10Z. The update package is 204.81 MB. This is a delta (partial) update that requires 8.3 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: bae45bddfba4b8f9846e0978f21986d47c9cdb4a.zip.