iPadOS 8.4 (build 12H143) is an official Apple over-the-air update for the iPad mini 2 (WiFi), released on 2015-06-30T15:51:14Z. The update package is 401.7 MB. This is a delta (partial) update that requires 8.1.1 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 1298a53e46b087320bd75caf0225a680b9685b99.zip.