iOS 9.9.11.2.1 (build 15C153) is an official Apple over-the-air update for the iPhone 5s (Global), released on 2017-12-13T18:11:54Z. The update package is 1.25 GB. This is a delta (partial) update that requires 9.3 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 9366650720bf027ef7c88c92a2d86cee9f8a4694.zip.