iOS 11.4.1 (build 15G5074a) is an official Apple over-the-air update for the iPhone 5s (GSM), released on 2018-06-25T17:06:29Z. The update package is 43.11 MB. This is a delta (partial) update that requires 11.4.1 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 9facb920ad3bfb0005ceebf57d108512958012d8.zip.