iOS 11.4 (build 15F5077a) is an official Apple over-the-air update for the iPhone 8 (Global), released on 2018-05-14T17:17:09Z. The update package is 322.31 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: 94ce0d6bd1a43a0f6b281c3990667295f03cab5e.zip.