If the device appears in Device Manager with a yellow exclamation mark or as "Unknown USB Device (Device Descriptor Request Failed)," follow these steps: 1. Power Cycle the USB Bus "Ghost" entries in the registry can cause conflicts. Unplug the USB device. Device Manager devmgmt.msc Universal Serial Bus controllers Right-click every instance of USB Root Hub and select Uninstall device
Since this ID is common in HP machines, visiting the HP Support website and searching for your specific laptop model's USB or chipset drivers is the best solution. 3. Use Driver Management Tools
The USB device identified by VID_214B&PID_7250&REV_0100 represents a specific SiFive product, likely related to their RISC-V based solutions. Understanding this device requires knowledge of its technical specifications, which aren't directly available from the VID, PID, and REV. However, it's clear that this device plays a role in the expanding ecosystem of open-standard, RISC-V based hardware. usb vid-214b amp-pid-7250 amp-rev-0100
The device string consists of three key identifiers:
: The specific engineering Revision 1.00 of the hardware chip architecture. Common Symptoms of a Failure If the device appears in Device Manager with
Since this is often a standard USB component, Windows possesses the necessary driver files but may not have linked them correctly. Open ( -> Device Manager).
If Windows logs a Device Descriptor Request Failed warning alongside a in the Device Manager hierarchy, a signaling error has corrupted communication between the chip and the host root complex. Device Manager devmgmt
: Unplug the hub and any attached devices. Shut down your PC and disconnect the power supply cable for 60 seconds to completely discharge the motherboard's USB capacitors. Restart and reconnect the hub directly to a rear motherboard port. 2. Intermittent Dropping on Linux and Raspberry Pi