iOS 9.9.17.2.1 (build 21C6066) is an official Apple over-the-air update for the iPhone XS, released on 2023-12-19T18:56:37Z. The update package is 5.57 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: 387534500408f0c0867b48bef124a1e581b12ed0.zip.