Microsoft Releases September 2025 Optional Preview Update KB5065790
On September 23, 2025, Microsoft introduced a significant non-security optional preview update, designated KB5065790 (build 22621.5984).This update, often referred to as the “C release, ”is designed to enhance system stability by addressing a variety of critical bugs, including issues related to sign-in freezes. Additionally, it resolves problems within Remote Desktop Protocol (RDP) setups, particularly those involving multiple monitors, and rectifies connection issues associated with the Server Message Block (SMB) protocol.
Key Fixes in Update KB5065790
Below is a summary of the noteworthy enhancements included in this update:
- [Authentication]
Resolved an issue that led to a non-responsive Windows sign-in screen when users entered their SIM PIN while connected through mobile broadband.
- [Browser]
This update rectifies a problem affecting Microsoft Edge in Internet Explorer compatibility mode, where the browser would halt due to specific same-domain redirects.
- [Country and Operator Settings Asset (COSA)]
Updates relevant profiles to ensure compatibility with specific mobile operators.
- [Display Kernel]
Addresses issues concerning display configuration changes during RDP sessions with multiple monitors. This fix is particularly crucial, as it prevents unexpected system shutdowns when disconnecting from docking stations during streaming activities.
- [Input]
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Corrected an error that caused improper display of some characters while utilizing the Chinese Input Method Editor (IME).
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This update also fixes an issue where certain Chinese characters appeared as empty boxes within character-restricted text fields, such as those in the Connection Manager Administration Kit.
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- [Networking (Known Issue)]
Resolves connectivity issues while accessing shared files and folders via the SMB v1 protocol on NetBIOS over TCP/IP NetBIOS (NetBT), following the installation of update KB5065431.
- [Printer]
This update rectifies an issue that caused the print queue interface to become unresponsive when viewed in Settings for shared printers.
- [System Services and Reliability]
Addresses a problem that resulted in the McpManagement service displaying without a description on the Windows operating system.
Further Information
For a comprehensive overview of this update, you can view the official support article here on Microsoft’s website.
For additional details and images, visit Neowin.
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