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  • Disabling it via stty didn't work? (man stty). Commented Aug 27, 2018 at 5:50
  • Other serial programs are screen minicom picocom arduino-serial, python serial.Serial(). Commented Aug 27, 2018 at 9:44
  • Looks like CuteCom (at least in Debian 9) will always assert DTR and RTS when opening the serial port, even when you set Flow Control to None. Try other programs as listed by @meuh. Commented Aug 27, 2018 at 9:57