iOS 12.1.1 (build 16C50) is an official Apple over-the-air update for the iPhone 5s (Global), released on 2018-12-05T18:10:21Z. The update package is 1.7 GB. This is a delta (partial) update that requires 10.2.1 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 71577ec5af383eeaa408f397928674660cd011af.zip.