iOS 11.3 (build 15E5216a) is an official Apple over-the-air update for the iPhone X (GSM), released on 2018-03-16T17:05:17Z. The update package is 72.22 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: 16eff4286bc91e974f7a064bed296dc5ab7fad40.zip.