iPadOS 8.4 (build 12H143) is an official Apple over-the-air update for the iPad mini 3 (WiFi), released on 2015-06-30T15:51:15Z. The update package is 370.5 MB. This is a delta (partial) update that requires 8.2 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 21174ced3e561cb7cf4373ece3de526f6028214c.zip.