iPadOS 8.4 (build 12H143) is an official Apple over-the-air update for the iPad 3 (WiFi), released on 2015-06-30T15:51:09Z. The update package is 294.69 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: d88579eb4268e4d6f709e6ab2fce9d1a2bd82484.zip.