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
![How to fix Unknown USB Device (Device Descriptor Request Failed) - USB device not recognized - YouTube How to fix Unknown USB Device (Device Descriptor Request Failed) - USB device not recognized - YouTube](https://i.ytimg.com/vi/BEBARf2Lo_k/mqdefault.jpg)
How to fix Unknown USB Device (Device Descriptor Request Failed) - USB device not recognized - YouTube
![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](https://htse.kapilarya.com/FIX-Unknown-USB-Device-Device-Descriptor-Request-Failed-In-Windows-10-5.png)