iOS 9.9.17.1 (build 21B74) is an official Apple over-the-air update for the iPhone 12, released on 2023-10-25T17:25:40Z. The update package is 5.8 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: 4e984015ce6ccb3831adad2ae38f43508cca331a.zip.