iOS 11.4 (build 15F79) is an official Apple over-the-air update for the iPhone 7 (GSM), released on 2018-05-29T17:17:11Z. The update package is 739.53 MB. This is a delta (partial) update that requires 11.2.5 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 4e19d12e9068e9bc3ddc82fc6a3c1c060ae42c4f.zip.