iOS 11.4 (build 15F5071a) is an official Apple over-the-air update for the iPhone 8 (GSM), released on 2018-05-07T17:11:35Z. The update package is 322.61 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: dab3b53a555936b1396837e6cdd7ff71f5563522.zip.