iOS 11.4 (build 15F5049c) is an official Apple over-the-air update for the iPhone 7 (GSM), released on 2018-04-16T17:08:29Z. The update package is 272.87 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: 432f6d6e00d80ba76d3cd99632fd424710ff874b.zip.