iOS 11.4 (build 15F5049c) is an official Apple over-the-air update for the iPhone 8 Plus (GSM), released on 2018-04-16T17:08:10Z. The update package is 287.27 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: 85187b5310d197a116f0132a548c922dbfb34b04.zip.