iOS 11.4 (build 15F5061e) is an official Apple over-the-air update for the iPhone 8 (GSM), released on 2018-05-01T17:06:19Z. The update package is 278.63 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: bc40993a2cde7b5d92afce87152aa96517a05ec5.zip.