iOS 11.4 (build 15F5049c) is an official Apple over-the-air update for the iPhone 7 (Global), released on 2018-04-16T17:08:27Z. The update package is 266.8 MB. This is a delta (partial) update that requires 11.4 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: edc546026142ed5373dbf7c801808604f2abd584.zip.