iOS 11.4 (build 15F79) is an official Apple over-the-air update for the iPhone 8 Plus (Global), released on 2018-05-29T17:15:40Z. The update package is 814.19 MB. This is a delta (partial) update that requires 11.1 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: b69a29b962bd2ea7af2b7a9d66aa336964909fce.zip.