iOS 9.9.15.3.1 (build 19D52) is an official Apple over-the-air update for the iPhone X (Global), released on 2022-02-10T18:14:53Z. The update package is 4.25 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: 72151e03c251fb2e49f6c6acf37e290f4ea8971e.zip.