What do I need to update the firmware on my 6770 (10speed) di2 setup to work with a pair of R8050 shifters?
External or internal battery?
External
Edit: thou I do have a spare internal battery I could use temporarily if that's easier
@Brommers started
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What do I need to update the firmware on my 6770 (10speed) di2 setup to work with a pair of R8050 shifters?