iOS 9.9.12.1 (build 16B5084a) is an official Apple over-the-air update for the iPhone 5s (GSM), released on 2018-10-15T17:03:27Z. The update package is 2.1 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: 129ff71ec822d97fce0b4f6ff313683987f9b8c9.zip.