iOS 9.9.16.3.1 (build 20D67) is an official Apple over-the-air update for the iPhone X (GSM), released on 2023-02-13T18:24:46Z. The update package is 4.32 GB. This is a delta (partial) update that requires 12.1.4 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 689ef0ada340549886bfa1a8e6485c09028b103f.zip.