iOS 12.1 (build 16B92) is an official Apple over-the-air update for the iPhone X (Global), released on 2018-10-30T17:15:51Z. The update package is 448.35 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: 3a17557ca3a9271d8dd18dd659da6320021f0132.zip.