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I cant't install mbed virtual serial port

Question asked by 韬敏 赵 on Oct 9, 2016
Latest reply on Oct 11, 2016 by Kerry Zhou

Hello everyone, when I try to install mbed virtual serial port following instruction of https://developer.mbed.org/handbook/USBSerial, i met a problem as follows.

First, I plugged my mbed usb to my computer(win7), it showed

then I followed the instructions, however it showed

 

How can I solve this problem? Anybody helps? Thanks a lot.

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