Geeetech

In case anyone misses it - I managed to download the firmware and conf with following command lines:

avrdude -p atmega2560 -c wiring -P com5 -b 115200 -F -U flash:r:existingMarlin_fw.hex:i
and
avrdude -p atmega2560 -c wiring -P com5 -b 115200 -F -U eeprom:r:existingMarlin_eeprom.hex:i

where ...