iPadOS 8.4 (build 12H143) is an official Apple over-the-air update for the iPad 3 (CDMA), released on 2015-06-30T15:51:10Z. The update package is 323.12 MB. This is a delta (partial) update that requires 8.1.2 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: dd3b472266b0c743ae4ad35faafad522ce036246.zip.