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You can't mix/match front rear 10/11spd https://road.cc/sites/default/files/Shimano%20Di2%20compatibility%20chart.pdf.
It used to work but with later software it wont.
thanksbye
Any reason I shouldn't use the older 11 speed di2 front mech, mixed with newer shifters and rear mech?
Specially the 6870 front mech. Being offered one for a good price.