iOS 13.3.1 (build 17D5050a) is an official Apple over-the-air update for the iPhone X (Global), released on 2020-01-22T18:07:21Z. The update package is 155.25 MB. This is a delta (partial) update that requires 13.3.1 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 2a9426c64cd020b2f7181dae0b0facd5f7f3053b.zip.