iOS 12.1 (build 16B92) is an official Apple over-the-air update for the iPhone X (GSM), released on 2018-10-30T17:16:13Z. The update package is 448.37 MB. This is a delta (partial) update that requires 12.0.1 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: b52df9c8a094113ba5235f18473ee66fb8f58036.zip.