Baud rate mismatch, or the STM32 firmware isn't sending data. Also, Windows 11 may have assigned a hidden COM port.
Navigate to the folder where you extracted the driver files (e.g., the folder containing dpinst_amd64.exe ) and click . Stm32 Virtual Com Port Driver Windows 11
. Professionals often still prefer an external CP2102 or FTDI chip just to avoid the "driver lottery". Baud rate mismatch, or the STM32 firmware isn't sending data