Big Thanks to Pionara - for providing this procedure - and all your hard work.
I follow the first post - then read the rest of this forum, gave it try and followed your directions, and it worked like a charm. I have an AVIC X920BT that had been upgraded to CNSD-210FM. Wanted to get the latest maps and BT software - seems to work well on my machine with an Iphone 4S.
Shout out to all the others who worked to make this happen, this forum really is great.