OK, with the "error reading" message, this tells me that the first step update has not been performed yet. Please go to the second link that I posted and walk thru those steps, ok.
.upd is correct
on some earlier 2011 vehicles, the extension had to be changed from .upd to .upn. but I think that you need to do both updates.
Originally Posted by MC61RAM1500
When I plug my Ipod into the port in the glove box I get the error reading message and the file I downloaded was uconnect.upd