iOS 9.9.12.1 (build 16B5089b) is an official Apple over-the-air update for the iPhone 5s (GSM), released on 2018-10-22T17:02:01Z. 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: 2fd718344a73f79cbbf42bb3ce88f33d2b06fa48.zip.