iOS 12.1 (build 16B5059d) is an official Apple over-the-air update for the iPhone X (GSM), released on 2018-09-18T17:20:18Z. The update package is 535.34 MB. This is a delta (partial) update that requires 12.0 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 20081577614473c566c43c34b65c024954b2bd79.zip.