iPadOS 8.4 (build 12H143) is an official Apple over-the-air update for the iPad mini (Global), released on 2015-06-30T15:51:09Z. The update package is 852.77 MB. This is a delta (partial) update that requires 7.1.2 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: b6737ed2e1341ac01a6057297f8bf4c5fce12218.zip.