Disklavier

I have a DGA1XG Disklavier Piano with a DKC100XG controller.   I am 
trying to load the most recent Flash ROM update that I downloaded from 
the Yamaha site.  The readme file says to push the play button while 
turning the unit on and it will put you in the proper mode to load the 
update.  When I do this it does not go into the update mode.  Anyone 
have a solution?

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