iOS 11.4 (build 15F5071a) is an official Apple over-the-air update for the iPhone 6+, released on 2018-05-07T17:11:41Z. The update package is 276.08 MB. This is a delta (partial) update that requires 11.3 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: acb4eb9d2a61de1efa059af5c7488c8e3c52a425.zip.