1】按boot进入固件跟新模式，电脑会出现一个U盘
2】放firmware.uf2到新出现的U盘，放入之后U盘自动消失
3】之后可以使用Thonny软件运行.py程序
========================================
1】Press Boot to enter firmware update mode. A U disk will appear on your computer.
2】Place firmware.uf2 on the newly displayed U disk. The U disk will automatically disappear after put it.
3】You can then run the *.py program using Thonny software.