This usually means a physical connection issue. Try a different USB port directly on the motherboard (avoid external USB hubs). Clean the metal contacts of the USB plug or the smart card itself.
Since SC GKDL usually masks a standard serial bridge chip, try one of these drivers:
: When installing the driver manually, ensure the installation prompt shows a verified publisher or a WHQL (Windows Hardware Quality Labs) digital signature. To help narrow down the exact file you need, let me know: sc gkdl usb2.0 driver
: Another industry standard. Official drivers are typically available through Prolific's support or manufacturer sites like 2. Manual Driver Selection (Windows 10/11)
Then search “Driver for VID_XXXX PID_YYYY” – that will give you the exact, correct driver every time. This usually means a physical connection issue
If Windows cannot find the driver, you need the Hardware ID:
When you plug this device into a USB port, your operating system relies on the driver to translate commands between the computer's CPU and the hardware. If you see an error or a yellow exclamation mark next to this name, your system lacks the specific instruction set needed to communicate with the hardware. Step-by-Step Installation Guide Since SC GKDL usually masks a standard serial
Connect the USB smart card reader to a working USB 2.0 or 3.0 port. Open (Press Win + I ).
Sometimes, Windows can find the driver automatically. In Device Manager, right-click the device, select Update driver , and choose Search automatically for drivers .
Which (e.g., Windows 10, Windows 11, macOS) are you running?
Users typically encounter the SC GKDL USB2.0 driver when connecting the following hardware: