iOS 11.3 (build 15E216) is an official Apple over-the-air update for the iPhone X (Global), released on 2018-03-29T17:11:26Z. The update package is 681.44 MB. This is a delta (partial) update that requires 11.2 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 082b6241858c4a20499025c31eb85ca3d3ad7dce.zip.