iOS 12.1 (build 16B5068i) is an official Apple over-the-air update for the iPhone XS, released on 2018-10-02T17:12:00Z. The update package is 363.12 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: 500aeec5b6e533425970efb4abb83b9ef3f9572e.zip.