iOS 12.1.2 (build 16C101) is an official Apple over-the-air update for the iPhone 5s (Global), released on 2018-12-17T21:06:36Z. The update package is 1.28 GB. This is a delta (partial) update that requires 11.4.1 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: c8065ff726d4cbc75d88cec56bec3f64dc5c5a54.zip.