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新买的EV2400，通过USB查到电脑上，没有任何反应，设备管理器中找不到通信接口，用EV2400_Updater_v0018更新固件，显示以下信息：
请问是什么问题？
update 固件以后您重启电脑试一下
7144.EV2400_Updater_v0020.zip
更新到V0.20试一下
