Windows 11 Update KB5074109 Disrupts Modems for Select Users
Many users have encountered issues with their modems after installing the January 2026 Security Update for Windows 11. The specific update in question is KB5074109, which has reportedly rendered modems inoperable for a segment of users. This situation adds to the ongoing challenges associated with recent updates to Windows 11.
Impact of Windows 11 Update KB5074109 on Modems
According to official documentation, the January update removed several legacy modem drivers. These drivers include:
- agrsm64.sys (x64)
- agrsm.sys (x86)
- smserl64.sys (x64)
- smserial.sys (x86)
As a result, many modems that rely on these drivers are no longer functional. Unfortunately, this significant detail was buried within the update notes, leading to widespread confusion among users. Reports have surfaced across various platforms, including Microsoft’s forums and third-party communities.
User Experiences and Reactions
Users have shared their frustrations regarding the update. One user, identified as Imsai8080, noted that a modem advertised as “Windows 11 compatible” ceased to function after the update. They reported restoring functionality by uninstalling KB5074109, allowing both their new and older modem to work again.
This situation has broader implications as many legacy systems, such as phone answering and logging devices, depend on these modem drivers. Multiple users have reported similar issues, indicating a shared struggle within the community.
Security vs. Usability
Microsoft has stated that the removal of these outdated drivers was necessary due to unpatched vulnerabilities, aiming to enhance overall system security. However, this rationale does little to alleviate user frustration. As one user, ohs77, pointed out, the 6-month-old modem they purchased stopped working because it required the now-removed agrsm64.sys driver.
The absence of updated drivers from manufacturers has left many users without options. For those reliant on these legacy modems, the only workaround involves uninstalling the problematic update and temporarily pausing future updates—a method not without its risks.
What to Do Next
If you find yourself affected by the changes in KB5074109, consider these steps:
- Uninstall the KB5074109 update from your system.
- Pause or disable Windows Update to prevent automatic reinstallation.
- Monitor for any announcements from your modem manufacturer regarding updated drivers.
While these options may provide temporary relief, it’s crucial to keep in mind that running an unpatched operating system poses security risks.
As the technical landscape evolves, users relying on older hardware must be prepared for changes like these. Have you experienced issues related to the KB5074109 update? Share your situation in the comments below.
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