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How do I flash / update the software on my Arduino Controller? (Impressora A602 3D Printer by HAVIT)

I need technical support with my HAVIT A602 3D printer.  I am unable to get my 3D printer to communicate with my computer.  I have already tried:

1) Replacing the existing controller with a new controller purchased directly from HAVIT.
2) Replaced and updated the drivers.
3) Tried connecting to 3 different computers, running Windows 7 & Windows 10.
4) Completely took apart the printer and checked every single connection.
5) I confirmed both the pc and controller were using COM 3 with a baud rate of 115200.
6) Tried using 3 different USB cables.
7) Tried both CURA and Repetier.

Despite this, it will not work.  I have included some random screenshots.

I am having trouble getting my Arduino to communicate over COM3 / baud 115200.  I was reading online that I should try flashing / updating the software on my controller.  I have absolutely 0 clue how to do this, and could really use some help making sure that I don't brick the controller.

Can anyone help?
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John HurstBusiness Consultant (Owner)Commented:
There is probably more that one way as there is more than one Arduino (mine is a very simpleton model). Here is a guide to firmware update that deals with RS232 (Com Port). It might fit. It is NOT for the feint of heart.

John HurstBusiness Consultant (Owner)Commented:
Did you try the flash method I posted above to do what you want?
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