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按照用户手册上的步骤来的，到USB-Based Firmware Upgrade这步显示no device connected.
我连了开发板，设备管理器那里也显示连接正常，问题界面如下：
感觉问题出在握手机制上面. 是不是 AFE4400 真忙于干别的任务了?
一直就是这一个任务，请问还没有其他可能原因呢？比如板子的问题？
