iPadOS 8.4 (build 12H143) is an official Apple over-the-air update for the iPad mini 2 (China), released on 2015-06-30T15:51:15Z. The update package is 423.07 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: 9a6de11f90aa8ce3d70ef321f76b5f23e4ec1913.zip.