iOS 9.9.17.1 (build 21B74) is an official Apple over-the-air update for the iPhone 13, released on 2023-10-25T17:25:40Z. The update package is 5.72 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: e8315887ae477b86c4f214f1c59f0860fb867ea0.zip.