iOS 11.4.1 (build 15G5063b) is an official Apple over-the-air update for the iPhone 5s (GSM), released on 2018-06-11T17:21:56Z. The update package is 208.32 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: 8450544bd4cde40135b067a161406ed45d85d9c5.zip.