iOS 8.4 (build 12H4098c) is an official Apple over-the-air update for the iPhone 6+, released on 2015-05-11T17:46:07Z. The update package is 142.1 MB. This is a delta (partial) update that requires 8.4 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 61456f703804162e3322cb7a41582fdcb952ee29.zip.