iOS 12.1 (build 16B5089b) is an official Apple over-the-air update for the iPhone X (GSM), released on 2018-10-22T17:01:56Z. The update package is 569.96 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: 03bda5d7d32f1a849fbf3c276dc45c46e136efcb.zip.