iOS 11.4 (build 15F5079a) is an official Apple over-the-air update for the iPhone 8 Plus (GSM), released on 2018-05-17T17:02:24Z. The update package is 325.2 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: 2add41bf298fa552cb94f16b6ebea799112ae857.zip.