iOS 11.4 (build 15F5061d) is an official Apple over-the-air update for the iPhone 5s (GSM), released on 2018-05-01T17:06:00Z. 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: 7a756b8b9b204ec32e5c095d2869ac3d552923c2.zip.