Without the correct QUSB Bulk driver, your PC will likely label the device as "Unknown Device" or "QHUSB_BULK" with a yellow triangle. In this state, professional tools—such as —cannot communicate with the phone.
Right-click the entry in and select Update driver .
The acronym "CID" in this driver context is the most distinct variable. It usually points to one of two technologies depending on the specific kernel version:
If your device is showing up as "QUSB_BULK" in Device Manager, follow these steps to resolve the driver error:
Flow control and concurrency