iOS 9.9.12.5.4 (build 16H6050) is an official Apple over-the-air update for the iPhone 5s (GSM), released on 2021-06-14T17:10:36Z. The update package is 2.11 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: 3546e52759d5dbd42a8aeb7b28d71c67e69e08bd.zip.