Accueil / usb device id vid ffff pid 1201

Usb Device Id Vid Ffff Pid 1201 [better]

The Enigma of VID_FFFF & PID_1201: A Deep Dive into a Suspicious USB Identifier

A. Rockchip Bootloader (Most Likely Candidate)

The specific pairing of VID FFFF and PID 1201 is frequently observed in devices utilizing Rockchip system-on-chip (SoC) architectures (e.g., RK3066, RK3188, RK3288, RK3399).

  • Context: When a Rockchip-based device (common in Android TV boxes, tablets, and SBCs like the Radxa Rock) enters Mask ROM Mode (a low-level recovery mode usually triggered by holding a recovery button or shorting pins), the internal USB OTG controller initializes with default values.
  • Function: In this state, the device identifies itself as VID:FFFF PID:1201 to signal to the host computer that it is ready to receive firmware via the Rockchip upgrade tool (e.g., RKDevTool or upgrade_tool).

Step 2: Windows Registry Sweep (via Device Manager)

  1. Right-click the Start button and select Device Manager.
  2. Expand Universal Serial Bus controllers.
  3. Look for "Unknown USB Device (Device Descriptor Request Failed)".
  4. Right-click it > Uninstall device.
  5. Unplug the USB device.
  6. Restart your computer.
  7. Plug the device back in after Windows fully loads.

5.1 Typical Use Case

The primary function of this VID/PID pair is a USB-to-serial converter for: usb device id vid ffff pid 1201

  • Debugging embedded systems (UART console).
  • Flashing firmware onto microcontrollers (ESP8266, ESP32, Arduino clones, STM32).
  • JTAG or SPI programming interfaces.

Potential fixes and actions

  • If caused by cable/port/hub: replace cable or use a different port.
  • If caused by firmware:
    • Re-flash official firmware using vendor updater or bootloader instructions.
    • If the device supports USB DFU, use dfu-util or vendor tools to reprogram.
    • If custom firmware was used, revert to known-good official firmware.
  • If device in bootloader intentionally:
    • Follow vendor instructions to switch to application mode (e.g., press reset/boot buttons in sequence).
  • If hardware fault:
    • Repair or replace defective components, reflow solder joints, or replace the device.
  • If descriptors malformed and you have firmware access:
    • Fix descriptor tables in firmware source and rebuild so VID and PID are set to valid values.
  • If vendor is unknown and the device is unbranded:
    • Use device class/subclass and interface descriptors to infer functionality (CDC ACM, HID, MSC, etc.) and try matching generic drivers like generic serial (CDC-ACM or FTDI-compatible), libusb-based drivers, or mass-storage drivers.

3. Driver Corruption within Windows

Sometimes, the USB device is physically fine, but Windows has cached corrupted driver settings. The vid_fFFF string may be the result of Windows misreading its own registry entries. This is particularly common after Windows updates or system crashes. The Enigma of VID_FFFF & PID_1201 : A