I recently tried to flash my Octopus Pro after I had previously flashed it but once i finished building the printer it would not connect so I attempted to reflash the PI and the Octopus board, however no after trying to flash i get this “Marlin_Octopus_pro_CDC_IN_FS_MODE”. Ive never seen this before nor do I understand it, I have been unable to find any information on this as well anything helps at this point.
Do you have Boot0 jumper closed by accident?