iOS 12.1 (build 16B5084a) is an official Apple over-the-air update for the iPhone XR, released on 2018-10-15T17:03:26Z. The update package is 233.57 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: 4321020188a1f95944a9483daa8d134e790fc2f2.zip.