iOS 11.4 (build 15F5061e) is an official Apple over-the-air update for the iPhone 8 Plus (GSM), released on 2018-05-01T17:06:21Z. The update package is 280.71 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: 0404414c001f238b25640dee8c0606b2f1ef1d92.zip.