iOS 11.4 (build 15F5037c) is an official Apple over-the-air update for the iPhone 8 (GSM), released on 2018-04-02T17:06:50Z. The update package is 324.16 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: 77eaf7f8f88feebca1fd395ed1e1e34418a0b41c.zip.