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使用C2Prog串口方式烧写.hex文件到28377s出现错误(no echo!)

使用C2Prog串口方式烧写.hex文件到28377s时候提示
Connecting with target (autobaud)...  OK.
Bootloading...  failed (no echo)!

求助什么原因,在C2Prog上的所欲波特率都试过结果一样