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 167.35 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: 6c514c93fd721d09e0cb958b4966693d66259ee7.zip.