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Correct. 10 speed eTube shifters (i.e. 6770 and 10 speed non-series) shifters will work perfectly well with 11 speed derailleurs even if they are all updated to the most recent firmware. That's the set-up my Brommers Bike #3 has, and it was working just fine and dandy yesterday. The only thing that won't work is a 10 speed FD and 11 speed RD with more recent firmware.
Brommers
Think that is just the FD not the shifters.