iOS 11.4 (build 15F5061d) is an official Apple over-the-air update for the iPhone 6+, released on 2018-05-01T17:06:03Z. The update package is 214.82 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: 93cfb916dfd45692a1eb639686049b255f47e32b.zip.