iPadOS 8.4 (build 12H143) is an official Apple over-the-air update for the iPad mini 3 (Cellular), released on 2015-06-30T15:51:15Z. The update package is 205.02 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: 96a496b73d6680c504e3fa951af16a4bd20f58d9.zip.