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How to update UM2 firmware


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Posted (edited) · How to update UM2 firmware

correct baud rate is 250000

In addition you have to find the correct COM port of course.


But USB cables highly differ in quality. There are even cables "for charging only". So  - if you have the choice - try a different cable first. Preferable one with ferrite cores.


Edited by tinkergnome
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    Posted · How to update UM2 firmware

    Hi Simon,


    You may have a problem with the USB to Serial conversion, to fix this it is better to use Arduino.

    Here is some picture s of how to do it:


    When setting up Arduino select card type first. Select tools, then card type.



    Next, tools again and then Port. Here it's show only Com 1.



    Now you connect your printer and you should get this -but maybe another com port number.



    The above see your printer, but it is not connected.


    But when you select the printer it will connect, shown like this.



    This example is with my UM2 ext.

    You should be able to use this one..


    When you see it connect, then exit Arduino and try Pronterface.


    Good luck.




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    Posted · How to update UM2 firmware

    Use Cura 15.04.5 like this.




    Just connect your printer and install default firmware.




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    Posted · How to update UM2 firmware



    It still didn`  t work with Cura...

    I then tried it with Xloader and it worked perfect:)

    now, alfter the FW upload its also "detected" by Cura.

    So a big Thank you:)


    best regards,



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    Posted · How to update UM2 firmware

    Great to hear that your printer is working again.




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