iOS 11.4 (build 15F5077a) is an official Apple over-the-air update for the iPhone 7 (GSM), released on 2018-05-14T17:17:25Z. The update package is 310.92 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: bd4811ac00d6d135299328ea57b5e89cfaba83f1.zip.