iOS 11.3 (build 15E216) is an official Apple over-the-air update for the iPhone 8 (Global), released on 2018-03-29T17:11:21Z. The update package is 747.99 MB. This is a delta (partial) update that requires 11.2.1 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: d416da17fd2470e1bc239d9cc7ec10c00f331bbb.zip.