iOS 9.9.11.4 (build 15F5077a) is an official Apple over-the-air update for the iPhone 5s (GSM), released on 2018-05-14T17:17:16Z. The update package is 1.8 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: 040b4ec815da8e0caaa0488a79c7015d05664b0d.zip.