iOS 11.4.1 (build 15G77) is an official Apple over-the-air update for the iPhone 6s+, released on 2018-07-09T17:10:29Z. The update package is 197.42 MB. This is a delta (partial) update that requires 11.4 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 5b26cf7a42d451d65cd6ddfb6560b7786c1be396.zip.