iPadOS 8.4 (build 12H143) is an official Apple over-the-air update for the iPad mini 2 (Cellular), released on 2015-06-30T15:51:14Z. The update package is 386.82 MB. This is a delta (partial) update that requires 8.2 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: db516ea8425cc088d70f056d0f3c39c9165fb0ff.zip.