iOS 11.4 (build 15F5071a) is an official Apple over-the-air update for the iPhone 8 Plus (Global), released on 2018-05-07T17:11:32Z. The update package is 325.21 MB. This is a delta (partial) update that requires 11.3 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: ef8184b005ad9e08d47b14b02bb44deea122caed.zip.