iOS 11.4 (build 15F5061d) is an official Apple over-the-air update for the iPhone 5s (Global), released on 2018-05-01T17:06:02Z. The update package is 213.77 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: 085b68d4fb4f8115017b85b7611a81843484b243.zip.