iOS 9.9.17.5.1 (build 21F90) is an official Apple over-the-air update for the iPhone XR, released on 2024-05-20T17:23:30Z. The update package is 5.51 GB. This is a delta (partial) update that requires 12.4 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 51aef431d8c7c208d478a5c86b24aa8c9f2435d8.zip.