iOS 11.3 (build 15E216) is an official Apple over-the-air update for the iPhone 8 (GSM), released on 2018-03-29T17:11:29Z. The update package is 744.86 MB. This is a delta (partial) update that requires 11.2.6 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 7d962902c15f597b6bec08d8223fc71d1b65f489.zip.