Install arduino IDE1.5. bla bla
Use the latest version that is beta and specifies drivers for the due
go to the arduino folder in windows explorer in the program files directory probably and search bossac copy this file to c: to make this easier.
put your davinici firmware in c:
open command prompt
bossac -p com19 -R -e -w -v -b 3DP01_20140310_FW_V1.1.G_RELEASE.bin
run that command line after erasing the flash on the printer using the 2 jumper pins.
replace the com19 with your com port and the 3DP01_20140310_FW_V1.1.G_RELEASE.bin with the name of the firmware you want to use.