iOS 9.9.12.3 (build 16F6156) is an official Apple over-the-air update for the iPhone 5s (GSM), released on 2019-05-13T17:05:09Z. The update package is 2.15 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: 1329f7cb6f789bbca4792d3057ce8bdc3601d84b.zip.