Yeah thanks, I was trying to follow that already for the usb connection, but I encountered that reset button issue that was pointed out in the firsts comments so I should retry with cleaning maybe. And then, just to say everything at this point, I think I didn't install correctly katapult because I had an error during the first compile, so I just tried to skip that part to see if it works. But I actually had the idea of switching to can bus connection.
The Canbus connection of the Octopus Pro is the RJ11 connector on the motherboard.
I'd recommend you purchase this RJ11 adaptor to connect the High/Low wires of the Canbus.
Here is the location of the high-low Canbus terminal ( 2 & 3)
Use this guide to install your Canbus network. Canbus Guide