I have an Ultegra 6870 Di2 groupset and I would like to use synchro shift.
In e-tube project, I select Customize, then Shift Mode Setting.
And I have an error message telling:
If SM-BRM1/SM-BRM2/SM-BTR2 is connected, shift mode will not function even if set.
What does it mean ? I can see that SM-BTR2 is the built-in battery, that I have on my bike.
Is it possible to use this function with 6870 ? If yes, how ?