iOS 9.9.13.3.1 (build 17D50) is an official Apple over-the-air update for the iPhone X (Global), released on 2020-01-28T18:27:44Z. The update package is 3.06 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: 3b0b4ca186e948f45b4fdf5cc2bc658e4a4e7715.zip.