iPadOS 8.4 (build 12H4125a) is an official Apple over-the-air update for the iPad mini 3 (China), released on 2015-06-09T17:53:04Z. The update package is 159.57 MB. This is a delta (partial) update that requires 8.4 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 6cb0eda03de1f0353c75d03b1c1b3ce573fee6df.zip.