iOS 9.9.11.4 (build 15F5037c) is an official Apple over-the-air update for the iPhone 5s (GSM), released on 2018-04-02T17:06:54Z. 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: 8c0439ea9c1394389c8212066b5d88ecd84956a1.zip.