You guys saved me here!....
With standard Arduino software install I was able to do:
$ ./avrdude -C ../etc/avrdude.conf -P /dev/tty.usbmodem1421 -b115200 -D -Uflash:w:/Applications/Prusa3d/prusa3d_mac_1_7_5/1_75mm_MK2-RAMBo13a-E3Dv6full.hex -v -patmega2560 -cstk500v2
and now my printer is back to normal...
I agree with the color legend not working for the colorblind... I had to have my son and wife differentiate the colors in a few places.
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