Even with the driver installed, your software needs to know which "door" to use. Right-click the and select Device Manager . Expand the Ports (COM & LPT) section. Look for USB-SERIAL CH340 (COM#) .
Before installing anything, unplug the USB cable from your computer. It is best to install the driver software before the hardware is connected to prevent Windows from assigning a generic, non-functional driver. 2. Download and Install the CH340 Driver seiki sk720t driver install
Try a different USB port, preferably a USB 2.0 port (black) rather than a USB 3.0 port (blue), as older chipsets sometimes struggle with high-speed ports. Even with the driver installed, your software needs
Plug the USB cable into the cutter and your PC. Power the machine on. You should hear the Windows "device connected" chime. 4. Identify the COM Port (Crucial Step) Look for USB-SERIAL CH340 (COM#)
The most common driver for the SK720T is the installer. Run the installer as an Administrator .
This usually means a driver conflict. Uninstall any existing "Prolific" or "CH340" drivers from the Device Manager, restart, and try a fresh install. Pro Tip for Windows 11 Users