iOS 11.4.1 (build 15G77) is an official Apple over-the-air update for the iPhone 6s, released on 2018-07-09T17:10:09Z. The update package is 781.39 MB. This is a delta (partial) update that requires 11.0.1 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 4a0bae86ac474bcc19f9344c96dd9ebe31e6ceb0.zip.