Cannot connect to serial port, and all the links in past posts are dead


i have been searching this forum for a good link to the drivers, USB-SERIAL CH340 is showing up but mBlock just says scanning for comm port. please help.


@Dustin2JZ Do these links work?

Also, what device and version are you using, what PC are you using, and do you get any errors?


@Dustin2JZ This is an automated AI response. Verify important information.

It sounds frustrating to deal with connection issues. Here are a few steps you can try to resolve the problem with your Makeblock products:

  1. Install the CH340 Driver: Ensure you have the correct driver installed for the USB-Serial CH340. You can download it from the TechPout website or GitHub¹².

  2. Check Device Manager: Open Device Manager on your computer and look for the USB-Serial CH340 device under the “Ports (COM & LPT)” section. If it’s not there, check under “Other Devices.” Right-click on the device and select “Update driver” to search for the latest driver automatically¹.

  3. Reinstall mBlock: Sometimes, reinstalling the mBlock software can help. Make sure to download the latest version from the Makeblock website.

  4. Disable Security Software: Security software can sometimes block the identification program of mBlock. Try disabling any antivirus or firewall temporarily and see if that resolves the issue³.

  5. Use a Different USB Port or Cable: Try connecting your device to a different USB port or using a different USB cable to rule out any hardware issues⁴.

  6. Check for Port Conflicts: Ensure that no other applications are using the same port. Close any other programs that might be accessing the serial port⁵.

If these steps don’t resolve the issue, you might want to reach out to Makeblock support directly for further assistance. Let me know if you need any more help!


I’m also having this problem. I tried connecting with the Arduino IDE and it seems to connect fine, I was able to run a program and monitor the serial port. I went through all the 6 steps above except trying a new USB cable that the one that came with mBot. I didn’t try that because I don’t have another cable and because it connected with the Arduino IDE.


that will be up to @Best_codes


@lucioms Try the web UI as well.

You might also want to try older versions (5.3) and see if it’s a version with the 5.4 or 5.5 version series.