When USB port connection error happens, please try this.
It may have happened because the USB driver has not been installed properly.
Please find this attached and follow the instruction below.
I attached a ZIP file which includes two .exe files below.
-. For 32 Bit window ⇒ "CP210xVCPInstaller_x86.exe" install and run this please.
-. For 64 Bit window ⇒ "CP210xVCPInstaller_x64.exe" install and run this please.