iOS 11.3 (build 15E5178f) is an official Apple over-the-air update for the iPhone 7 (Global), released on 2018-02-06T18:21:27Z. The update package is 367.67 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: 751125e13c7ea3f8364b9ec80e6c36b78421d962.zip.