iOS 11.4 (build 15F5037c) is an official Apple over-the-air update for the iPhone 8 (Global), released on 2018-04-02T17:06:47Z. The update package is 324.96 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: a67862c0ad2eb4748e9fd1bf73451c8426950aeb.zip.