iOS 11.4 (build 15F5071a) is an official Apple over-the-air update for the iPhone 6+, released on 2018-05-07T17:11:45Z. The update package is 225.85 MB. This is a delta (partial) update that requires 11.4 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: fe61a7ba375d91f8f00172994489120933d324b8.zip.