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 1.76 GB. This is a delta (partial) update that requires null already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 0b3ac9813c01eb09fafef4b2948e8397a6e7bc9b.zip.