3D Printer AVR Firmware Backup

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avrdude \
  -c <programmer type> \
  -P <connection port> \
  -b <override RS-232 baudrate> \
  -p <partno, AVR device> \
  -U <memtype>:r:file_name[:format]

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Use w (write) instead of r (read) for the -U option.

HTA3D Arduino USB-to-Serial example

avrdude -c wiring -P COM3 -b 115200 -p m2560 -U flash:r:flash-orig.hex:i
avrdude -c wiring -P COM3 -b 115200 -p m2560 -U eeprom:r:eeprom-orig.hex:i

References

• https://arduino.stackexchange.com/a/83883
• https://github.com/avrdudes/avrdude
• https://www.nongnu.org/avrdude/user-manual/avrdude_4.html