iOS 11.4 (build 15F5079a) is an official Apple over-the-air update for the iPhone 8 (Global), released on 2018-05-17T17:02:19Z. The update package is 55.64 MB. This is a delta (partial) update that requires 11.4 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: ebe5874dcd28693c3893be4d2615975a9f8cb2dc.zip.