iOS 9.9.11.1 (build 15B5066f) is an official Apple over-the-air update for the iPhone 5s (GSM), released on 2017-09-27T16:55:48Z. The update package is 1.79 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: b2e4e15e1284e634b6db38ac313cb3c1da049c3e.zip.