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@gregrgr 可以了，之前一直进不去升级模式，进入升级模式需要PB3也是低电平状态下才能进入升级模式
芯片没有代码时候一键下载完成 第二次下载出现 开发板代码是正常运行 根据官方教程还是无法进入升级模式
