Under Linux I flashed the firmware .hex file with avrdude:
avrdude -c stk500v2 -b 115200 -p Atmega2560 -v -P /dev/ttyACM0 -D -U 1_75mm_MK2-RAMBo13a-E3Dv6full-3.0.8.hex
Even better would be compiling the firmware myself, but so far the Arduino project didn't want to be built..
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