USB Bootloader not recognized after upload a sketch · Issue #735 · stm32duino/Arduino_Core_STM32 · GitHub
![microcontroller - Mysterium Keyboard ATmega32a malfunctioning. "USB device not recognized." - Electrical Engineering Stack Exchange microcontroller - Mysterium Keyboard ATmega32a malfunctioning. "USB device not recognized." - Electrical Engineering Stack Exchange](https://i.stack.imgur.com/qPSQk.png)
microcontroller - Mysterium Keyboard ATmega32a malfunctioning. "USB device not recognized." - Electrical Engineering Stack Exchange
USBDevice not working on STM32H743, debug and trace problems · Issue #13641 · ARMmbed/mbed-os · GitHub
![microcontroller - STM32F4xx with CP2102N - CP2102N not recognized by the PC - Electrical Engineering Stack Exchange microcontroller - STM32F4xx with CP2102N - CP2102N not recognized by the PC - Electrical Engineering Stack Exchange](https://i.stack.imgur.com/DNJ1W.png)