iOS 11.4.1 (build 15G5054c) is an official Apple over-the-air update for the iPhone 6s+, released on 2018-05-30T17:05:17Z. The update package is 223.3 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: 03624e07de99209e4706df0361bcb69e51e79e24.zip.