iOS 8.4 (build 12H143) is an official Apple over-the-air update for the iPhone 6, released on 2015-06-30T15:51:24Z. The update package is 569.2 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: 03e4de6dfee4a3338fdcca4614fcd0aa833445c0.zip.