If your modem (yes, some people still use these things) stopped working after installing the January 2026 Security Update for Windows 11, you are not alone. A growing number of users have reported that installing update KB5074109 rendered their modems unusable. At first glance, it looks like yet another bug added to what has already been a rough Patch Tuesday for Windows 11.
The KB5074109 update has already been linked to NVIDIA GPU issues, causing black screens and performance drops, app crashes, boot…

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