By Jim Weaver, Service Manager, Fit Werx, VT Note:  As of 8/3/14 firmware updates from Shimano remove the functionality  between 6770 and 6870/9070 electronic components being used together. Some previous firmware versions allowed the below conversion to function without replacing the front derailleur, but firmware being installed as of 8/3/14 will irreversibly render such a … Continue reading Converting Shimano Ultegra 6770 Di2 to 11 Speed