iOS 9.9.17.4.1 (build 21E236) is an official Apple over-the-air update for the iPhone 13, released on 2024-03-21T17:22:05Z. The update package is 5.69 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: 40497b95ea903c12ec792d45367d94b5a8529638.zip.