iOS 8.4 (build 12H143) is an official Apple over-the-air update for the iPhone 6+, released on 2015-06-30T15:51:23Z. The update package is 664.15 MB. This is a delta (partial) update that requires 8.0 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: ae630112ee895a193c506958ade9e4f8103a1045.zip.