iOS 11.4.1 (build 15G5054c) is an official Apple over-the-air update for the iPhone 6, released on 2018-05-30T17:05:15Z. The update package is 221.02 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: 313c7a51dfb216076c92ae794cab2097087de542.zip.