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EV2400: quality problem

Part Number: EV2400

Hi team,

I got a question from customer.

Ev2400 is not recognized when connected to the computer,The data cable and computer have been replaced with new ones,
Five ev2400s are purchased, and the other four ev2400s can be used normally. Is it a quality problem? How to deal with it?
order number:T01446132                Purchase date: June 2, 2021
The normal ev2400 is connected to the computer, and the upper computer displays ev2400,The other one doesn't show up.

Thank you very much for your help.

Best regards,