iOS 12.1.3 (build 16D39) is an official Apple over-the-air update for the iPhone X (Global), released on 2019-01-22T18:08:56Z. The update package is 287.43 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: b616c433c41187d1868ea2b84516a230dd57fbc2.zip.