iOS 12.1.1 (build 16C50) is an official Apple over-the-air update for the iPhone 5s (Global), released on 2018-12-05T18:10:24Z. The update package is 1.33 GB. This is a delta (partial) update that requires 11.2.1 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: a911402618a61d41daf0a503cb74f4334373e5bc.zip.