iOS 11.4 (build 15F5037c) is an official Apple over-the-air update for the iPhone 7 Plus (GSM), released on 2018-04-02T17:07:02Z. The update package is 316.44 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: 6ff47a35b34511246d85426da5343c5673df5057.zip.