There's nothing to upgrade with respect to the radio (COMAND).
Just install the phone kit.
Here's the procedure for a 2005. What year is yours?
http://phdwebsite.powerpulse.cc/Phone%20Install%20Bulletins/2005%20E%20Sedan.pdf
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Kent Christensen
Albuquerque
'07 GL320CDI, '10 CL550. '01 Porsche Boxster
Two BMW motorcycles
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