iOS 12.1.2 (build 16C101) is an official Apple over-the-air update for the iPhone XS Max, released on 2018-12-17T21:06:21Z. The update package is 499.34 MB. This is a delta (partial) update that requires 12.0 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: c8dc76bda3782b6d09a2767072fc9780ea2fcca7.zip.