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EV2300连到电脑上显示为无法识别的USB设备



EV2300通信盒连到电脑上面,会显示为“无法识别的USB设备”,系统是windows7  64bit的,之前用的时候好好的,最近时而可以连上,时而出现无法识别的现象,EV2300的驱动都正常安装的,是这个EV2300通信盒换了吗?