iOS 11.4 (build 15F79) is an official Apple over-the-air update for the iPhone 6+, released on 2018-05-29T17:16:13Z. The update package is 688.43 MB. This is a delta (partial) update that requires 11.2.6 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 3721173a18f855117f8875da7d48bda6b275d346.zip.