Repetier or Octoprint cannot connect the board K8400

Hi all,

After assembling my printer K8400, It works perfectly from SD Card but when i connect it via USB to the PC / Raspberry PI (Octoprint) is detected as serial COM but I cannot connect to it with repetier/octoprint or any other software. It tries to connect but returns “xxxxxxxxxx”

BTW:

Issueing the ls command with the board connected I get a positive response ( there is a COM port ). With the board disconnected I get the normal no COM detected.

I´m assuming there’s some protocol error in the board.

Has anyone had some kind of this problem?

P.S. - This board was already flashed with the 1.4 - 2 head firmware.

Thanks in advance,

JPereira