iOS 11.4 (build 15F5061d) is an official Apple over-the-air update for the iPhone 7 (GSM), released on 2018-05-01T17:06:13Z. The update package is 203.48 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: c2538b01d6bd88b3faa54bd5a51f37861783039a.zip.