iOS 11.4 (build 15F5071a) is an official Apple over-the-air update for the iPhone 8 Plus (GSM), released on 2018-05-07T17:11:36Z. The update package is 302.15 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: cf35cc5b19be8e0c7e41659c00f77f84f4a06f26.zip.