iOS 12.1 (build 16B5089b) is an official Apple over-the-air update for the iPhone XS, released on 2018-10-22T17:01:58Z. The update package is 234.61 MB. This is a delta (partial) update that requires 12.1 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 315acfaecb8d6947bcdc13aea0a0468a9d1d97e1.zip.