iOS 12.1 (build 16B5084a) is an official Apple over-the-air update for the iPhone X (GSM), released on 2018-10-15T17:03:22Z. The update package is 569.09 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: 34a7353e56d8f06ddb4cb59d6a9d9800304c3dc3.zip.