iOS 11.3 (build 15E5178f) is an official Apple over-the-air update for the iPhone 7 (GSM), released on 2018-02-06T18:21:27Z. The update package is 366.85 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: 7461006283d37ad85f59d3ddc247db4c794e5aee.zip.