Starting with Windows 10, the UMDF 2 driver works seamlessly with Windows Hello for Business and Microsoft Entra ID (formerly Azure AD) certificate-based authentication. No shims or compatibility layers are required.
A "yellow bang" (exclamation mark) appears in Device Manager with the message "This device is not working properly because Windows cannot load the drivers". microsoft usbccid smartcard reader umdf 2 driver
The reader appears in Device Manager, but Windows does not prompt for a PIN or certificate. Starting with Windows 10, the UMDF 2 driver
The UMDFHost.exe process consumes significant CPU when using the smartcard. Starting with Windows 10
All of this happens in , meaning that even a faulty smartcard or a buggy reader firmware will not crash the Windows kernel.