iOS 11.4 (build 15F5079a) is an official Apple over-the-air update for the iPhone 7 (GSM), released on 2018-05-17T17:02:36Z. The update package is 311.02 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: 3f9b5d83033d69c25abf58c22fa610d2e1bb57db.zip.