iOS 12.1.2 (build 16C101) is an official Apple over-the-air update for the iPhone XS Max, released on 2018-12-17T21:06:22Z. The update package is 96.09 MB. This is a delta (partial) update that requires 12.1.1 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 8dfd3d70cb89961f06d937cb774ceb6c29901580.zip.