iPadOS 8.4 (build 12H4086d) is an official Apple over-the-air update for the iPad mini 2 (China), released on 2015-04-27T17:47:05Z. The update package is 143.02 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: 78ac23a3ca3862907d7861d8da6f9f656541b55f.zip.