iOS 12.1 (build 16B92) is an official Apple over-the-air update for the iPhone X (GSM), released on 2018-10-30T17:16:06Z. The update package is 1.64 GB. This is a delta (partial) update that requires 11.0.1 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: d4239c007ce4efa4381ed1c61bffdec528f171db.zip.