iOS 11.4 (build 15F5077a) is an official Apple over-the-air update for the iPhone 7 (Global), released on 2018-05-14T17:17:23Z. The update package is 311.74 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: 46f52ab659bedf63cdb21b52b0412a8d5aff0d2b.zip.