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 268.54 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: feac31d0cf6077dfb48c0796bc6da2aa05d7f6ed.zip.