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 428.24 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: 78118bd19fcac1e5ece85b09b944acad78f6ac36.zip.