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芯片问题

使用一个USB转换器,利用C2Prog烧录程序,SCI启动模式,似乎因为电压不稳造成C2Prog显示wrong key,然后仿真器也连接不上,请问这个问题怎么解决?之前虽然也会显示wrong key,但是仿真器可以连接。