iOS 11.4 (build 15F5061e) is an official Apple over-the-air update for the iPhone 8 (GSM), released on 2018-05-01T17:06:20Z. The update package is 210.06 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: 8043d4348d3a098a4518d331c30361abbf15e49e.zip.