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I shutdown Printer, then power on... Printer works, no problem anymore. I do not understand what's happen. Sorry...
Just for testing : re-uploaded same firmware (same binairies), the connection works fine after upload ! Printer is OK
- Firmware is set to Marlin - Port used is /dev/serial/by-id/... (Port is programming port) - Baud rate set to 250 000 matches the firmware No this is a SAM3X8E board : https://reprapworld.com/documentation/datasheet_ultratronics10_05.pdf