iOS 11.4 (build 15F5071a) is an official Apple over-the-air update for the iPhone 7 (GSM), released on 2018-05-07T17:11:55Z. The update package is 311.4 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: a1804a601244de89cf5832febb72be954d5409ef.zip.