iOS 11.4 (build 15F5061e) is an official Apple over-the-air update for the iPhone 8 (GSM), released on 2018-05-01T17:06:19Z. The update package is 278.25 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: 9fa57d2a6f32861bd0ad6601030ad9c60a56109a.zip.