Have you installed the driver? This article may help solve your problem.
https://www.chanelink.com/community/post/co2-cutting-and-engraving-control-system-unable-to-download-files-to-the-board-3872
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The file cannot be downloaded to the RDC6442G controller
I don't know why, but I couldn't successfully download the file to the RDC6442G controller. When I transferred the design file to the controller through the USB interface, the system didn't respond, and there was no progress bar or confirmation prompt displayed on the screen. The file remained in an untransferred state. Any suggestions?
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thanks