iOS 8.4 (build 12H4125a) is an official Apple over-the-air update for the iPhone 6+, released on 2015-06-09T17:53:06Z. The update package is 168.13 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: b05a15d69e00aff3405515065d63b9cc2b3a855d.zip.