iOS 12.1.2 (build 16C101) is an official Apple over-the-air update for the iPhone 5s (Global), released on 2018-12-17T21:06:32Z. The update package is 1.67 GB. This is a delta (partial) update that requires 10.3.3 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 9e13403d59d9481374a0b54f245b5a0a7c2c8d4e.zip.