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F28M35瘫痪了,跪求帮忙



不知道什么原因,从昨天起F28M35就一直连接不上了,今天又试了好几次,还是不行,一直显示下面的错误。今天我还把以前都调试成功的例程拿过来试着想跑一下,可就是一直连接不上。希望各位帮忙解答一下,非常感谢。