iOS 12.1.2 (build 16C101) is an official Apple over-the-air update for the iPhone X (GSM), released on 2018-12-17T21:06:17Z. The update package is 483.64 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: d49c8bee75d0e7dc67bfac8dcb948bfa7a3d31c4.zip.