iPadOS 8.4 (build 12H4086d) is an official Apple over-the-air update for the iPad mini (WiFi), released on 2015-04-27T17:47:03Z. The update package is 118.82 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: 60214e86ac82f7aa0ac36b1ee34db8e2e7decfbc.zip.