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 183.82 MB. This is a delta (partial) update that requires 8.3 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: f28d013446fcab94a049ebddb18dd7947beec592.zip.