iOS 11.4 (build 15F79) is an official Apple over-the-air update for the iPhone 7 (GSM), released on 2018-05-29T17:17:10Z. The update package is 795.99 MB. This is a delta (partial) update that requires 11.1 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 9d67c0c14b38ea49117570b37d27cd09146fb2fc.zip.