Can I upgrade to Synchro shifting on a 10s Di2 bike? (Ultegra 6770)
I just installed a Di2 6770 10spd front and rear derailleur with a BT-DN110 internal battery.

I can confirm that once I update firmware on all the components, eTube does NOT allow me to set up synchro shifting.  

Very disappointed considering the battery has all the hardware necessary to support it.