iOS 11.3 (build 15E216) is an official Apple over-the-air update for the iPhone 8 (GSM), released on 2018-03-29T17:11:27Z. The update package is 846.32 MB. This is a delta (partial) update that requires 11.0.1 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: e9bc8ccf0768e13d2c8cad7565b8912397450fa6.zip.