iOS 11.3 (build 15E5178f) is an official Apple over-the-air update for the iPhone 8 (Global), released on 2018-02-06T18:21:23Z. The update package is 377.8 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: c71622dcaddbbe2c55b689c7f92cb57db47b1df1.zip.