iOS 11.3 (build 15E5189f) is an official Apple over-the-air update for the iPhone 8 (Global), released on 2018-02-20T18:06:22Z. The update package is 323.31 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: d32511a5a316249d5e1189f2d179502899f29b7b.zip.