iOS 11.4.1 (build 15G77) is an official Apple over-the-air update for the iPhone 6s, released on 2018-07-09T17:10:07Z. The update package is 1.34 GB. This is a delta (partial) update that requires 10.3.2 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 5591b57e57566190c3490e7e8d325761b2bb58ea.zip.