使用arduino烧写esp32模块遇到的无法烧录问题，时钟无法烧录遇到如下提示
后来搜索在如下连接找到解决方法：
https://github.com/espressif/esptool/issues/226
方法如下：
在界面上出现
Connecting...字样时候按住boot按钮即可，等到出现烧录的时候就可以松开了
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