iOS 9.9.11.2.1 (build 15C6153) is an official Apple over-the-air update for the iPhone 5s (GSM), released on 2017-12-13T18:03:13Z. The update package is 1.72 GB. This is a full OTA update that can be applied from any compatible base version. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 10568900e3dcbe735e02a0d017f5d85f6d06ae78.zip.