Disable your Antivirus or Windows Defender temporarily during the installation process.
Most Jinka 721 models use the chipset. You can download the official, WHQL-certified driver directly from the chip manufacturer: -VERIFIED- Download Usb Driver Jinka 721
. While the hardware is robust, establishing a reliable connection between your computer and the plotter hinges entirely on the proper installation of the USB driver Why the Driver Matters -VERIFIED- Download Usb Driver Jinka 721