iOS 12.1.3 (build 16D39) is an official Apple over-the-air update for the iPhone 5s (Global), released on 2019-01-22T18:09:51Z. The update package is 312.33 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: 354d038129083408cee07a5db87c86dc5883f95e.zip.