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  • use baud rate of 9600 ... that should remove the possibility that 115200 is not supported Commented Jun 16, 2020 at 14:25
  • Thanks for the suggestion. I just tried baudrate of 9600 with ser2 = serial.Serial('COM9',9600) but it has the same result. Commented Jun 16, 2020 at 14:31
  • 1
    The Leonardo uses the AVR109 protocol, not STK500. Commented Jun 16, 2020 at 14:41
  • 1
    ww1.microchip.com/downloads/en/AppNotes/doc1644.pdf Commented Jun 16, 2020 at 14:41
  • 3
    the point is, there is some negotiation described in the protocol specification. you can't simply dump the hex to com port Commented Jun 16, 2020 at 14:44