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CC2540 USB 没法被正常识别

Other Parts Discussed in Thread: CC2540

刚买的CC2540开发套件,我在HostTestRelease的固件刷到USB里后,将其插入电脑(WIN7系统)后。就出现以下情况。

USB没法被正常识别,我试了手动更新驱动,只是出现第三张图的提示,其它还是什么变化也没有。