iOS 12.1 (build 16B5084a) is an official Apple over-the-air update for the iPhone XS, released on 2018-10-15T17:03:24Z. The update package is 236.7 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: 90fa91d9442c85942221c0055af2b0cf786d6e7d.zip.