iOS 11.4.1 (build 15G77) is an official Apple over-the-air update for the iPhone 6s+, released on 2018-07-09T17:10:23Z. The update package is 1.46 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: cb7356f494ded06bd24274eb858cf197b20d14e3.zip.