This points to data corruption. Ensure Flow Control is set to Hardware (RTS/CTS) in both Device Manager and your cutting software.

Simply installing the driver is not enough; the cutting software needs to be configured correctly.

By following this report, users should be able to successfully install and use the Jinka 721 driver on Windows 10 64-bit. If further assistance is required, please do not hesitate to contact the device manufacturer or a qualified support specialist.