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 281.09 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: 4f05567c384ba3cb3d8eba4272f59d2d1a73ebbd.zip.