iOS 11.3.1 (build 15E302) is an official Apple over-the-air update for the iPhone 7 Plus (Global), released on 2018-04-24T17:11:25Z. The update package is 1.53 GB. This is a delta (partial) update that requires 10.0.1 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: b9122dd28668dc5c5e306a61c88c8513694296fc.zip.