iOS 11.3.1 (build 15E302) is an official Apple over-the-air update for the iPhone 7 (Global), released on 2018-04-24T17:11:22Z. The update package is 791.83 MB. This is a delta (partial) update that requires 11.1.1 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: dc09ff7fde166b4f267a5c3472efee49fc55f4b0.zip.