iOS 12.1.1 (build 16C50) is an official Apple over-the-air update for the iPhone 5s (Global), released on 2018-12-05T18:10:25Z. The update package is 1.28 GB. This is a delta (partial) update that requires 11.3 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 1e6843b55287476d655e49073824ea75da70a84a.zip.