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F5529 已经烧断了熔丝，使用USB BSL升级过程中途拔掉，之后无法识别正确的USB设备了。
原本程序里是有检测到USB插入，跳转到BSL升级程序。 现在在flash擦除及烧录过程中，拔掉了USB导致失败， 有什么办法可以恢复进入到BSL？?
用串口bsl试试
再次进入Boot模式啊
