STM32F407 USB FS (Device Mode) not recognized. "Unknown USB Device (Device Descriptor Request Failed)" Error!
STM32F407 USB FS (Device Mode) not recognized. "Unknown USB Device (Device Descriptor Request Failed)" Error!
![pcb design - STM32CubeMX USB error "Unknown USB Device(Descriptor Request Failed)" - Electrical Engineering Stack Exchange pcb design - STM32CubeMX USB error "Unknown USB Device(Descriptor Request Failed)" - Electrical Engineering Stack Exchange](https://i.stack.imgur.com/k4oZ6.png)
pcb design - STM32CubeMX USB error "Unknown USB Device(Descriptor Request Failed)" - Electrical Engineering Stack Exchange
![usb hub - FE1.1s Based USB hub - USB device descriptor failed - Electrical Engineering Stack Exchange usb hub - FE1.1s Based USB hub - USB device descriptor failed - Electrical Engineering Stack Exchange](https://i.stack.imgur.com/6wg6N.jpg)
usb hub - FE1.1s Based USB hub - USB device descriptor failed - Electrical Engineering Stack Exchange
![pcb design - STM32CubeMX USB error "Unknown USB Device(Descriptor Request Failed)" - Electrical Engineering Stack Exchange pcb design - STM32CubeMX USB error "Unknown USB Device(Descriptor Request Failed)" - Electrical Engineering Stack Exchange](https://i.stack.imgur.com/I31si.png)
pcb design - STM32CubeMX USB error "Unknown USB Device(Descriptor Request Failed)" - Electrical Engineering Stack Exchange
![Solved: Fix for Unknown USB Device (Device Descriptor Request Failed... - HP Support Community - 5973953 Solved: Fix for Unknown USB Device (Device Descriptor Request Failed... - HP Support Community - 5973953](http://troubleshooter.xyz/wp-content/uploads/2016/06/uninstall-Unkow-USB-device-Device-Descriptor-Request-Failed.png)