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Handy for updating firmware on 12sp Di2 wireless shifters
by RichBklyn
Cycling Enthusiast
New York City
I used this to connect my normally wireless shifters to the battery (seatpost) in order to update the L and R shifter firmware. A lot easier than pulling out the battery in the seatpost.
To update 12 speed shifter software, disconnect wire from front derailleur, connect this junction to wire, then connect a second wire to the shifter. Use Shimano software. Boom.
