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I had this problem like this before. Try to unplug and re-plugin the USB port, see if it works. It's due to the bad handshake between device and your computer, and there will infinite times of handshaking which make the system 'un-responsing'
Thanks for your advise， I genuinely appreciate it. Need to take a shot to provide you my progress. Do you mean unplugging the USB while its "un-responsing" state?
