When there is no serial port shown after connecting the mainboard to the Letscode software (as shown below)
（No serial port is shown after connecting the mainboard）
Solution: Install the driver for the mainboard
1.Log in the link and download the zip file:
2.Decompress the zip file just downloaded, and then you will see:
3.If the system of your computer is a 32-bit system, please click CP210xVCPInstaller_x86.exe to install, if it is a 64-bit system, please click CP210xVCPInstaller_x64.exe to install.
4.Restart the Letscode software.