iOS 11.4 (build 15F5079a) is an official Apple over-the-air update for the iPhone 6+, released on 2018-05-17T17:02:28Z. The update package is 42.13 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: 7b96f61bd9d8246de11fb567f9f8dae5c50c4ad9.zip.