iOS 9.9.11.0 (build 15A372) is an official Apple over-the-air update for the iPhone 5s (GSM), released on 2017-09-12T19:09:29Z. The update package is 1.47 GB. This is a delta (partial) update that requires 8.2 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 7f76bc3204ea472649e9ed39697a5fdaf835491e.zip.