iOS 11.4.1 (build 15G77) is an official Apple over-the-air update for the iPhone 5s (GSM), released on 2018-07-09T17:09:32Z. The update package is 677.53 MB. This is a delta (partial) update that requires 11.2.1 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 322d72b92ccf93e7928e5e4642a0691a9d0236ff.zip.