iOS 9.9.17.2.1 (build 21C66) is an official Apple over-the-air update for the iPhone XR, released on 2023-12-19T18:58:06Z. The update package is 5.41 GB. This is a delta (partial) update that requires 12.1 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: d1f2bc498325c48313c6d27ae9367c0dc4f1cfb6.zip.