iOS 11.4 (build 15F5037c) is an official Apple over-the-air update for the iPhone 7 (GSM), released on 2018-04-02T17:07:01Z. The update package is 313.21 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: 173a01030f0a65df5ba1dd53c3105519945db49f.zip.