iOS 11.4 (build 15F5049c) is an official Apple over-the-air update for the iPhone 8 (Global), released on 2018-04-16T17:08:02Z. The update package is 284.66 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: 19d65c29d63f9913f41a00fb85d7cab3d5d6dc52.zip.