Introduction

The Windows 11 KB5050092 update, released on January 29, 2025, introduced a significant issue affecting USB-connected dual-mode printers. Users reported that their printers began producing unexpected outputs, including random text and network commands, disrupting standard printing operations. (bleepingcomputer.com)

Background Information

Dual-mode printers support both USB Print and Internet Printing Protocol (IPP) over USB. This dual functionality allows printers to operate as traditional USB devices and as network printers using IPP. The KB5050092 update inadvertently caused the Windows print spooler to misinterpret IPP protocol messages, leading printers to output these messages as printed text. (neowin.net)

Technical Details

The issue primarily affected Windows 10 version 22H2 and Windows 11 versions 22H2 and 23H2. Users observed that upon powering on or reconnecting their printers, the devices would print lines beginning with "POST /ipp/print HTTP/1.1," followed by other IPP-related headers. This behavior resulted from the print spooler sending IPP protocol messages directly to the printer, which were then printed as text. (learn.microsoft.com)

Implications and Impact

This malfunction disrupted normal printing tasks, causing inconvenience for both individual users and organizations relying on affected printers. The unexpected printouts led to wasted resources, including paper and ink, and required additional time to troubleshoot and resolve the issue.

Resolution and Workarounds

Microsoft addressed the problem through a Known Issue Rollback (KIR), a feature that reverts specific non-security updates causing issues. For enterprise-managed devices, IT administrators were advised to install and configure special Group Policies to implement the rollback. The necessary Group Policies could be found under Computer Configuration > Administrative Templates. After applying the Group Policy, a system restart was required to activate the changes. (learn.microsoft.com)

Additionally, Microsoft released the KB5053657 update on March 25, 2025, which included a permanent fix for the printing issue. Users were encouraged to install this update to resolve the problem without the need for manual intervention. (windowslatest.com)

Conclusion

The KB5050092 update's unintended impact on USB-connected dual-mode printers highlights the complexities involved in system updates and hardware compatibility. Microsoft's prompt response through the KIR feature and subsequent updates demonstrates the importance of swift action in addressing such issues. Users are advised to keep their systems updated and to monitor official channels for information on potential issues and resolutions.