iOS 11.4 (build 15F5077a) is an official Apple over-the-air update for the iPhone 8 (GSM), released on 2018-05-14T17:17:12Z. The update package is 322.7 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: 9080bddf3b79486be0c181d7f3c0f6e4d72ae6b2.zip.