Start here to update firmware:
https://www.youtube.com/watch?v=cyWhmWKnoG0
Here next to update maps:
https://www.youtube.com/watch?v=Ma49TYCPxnE
I did this, but didn't have to install a third party mod. After I did the firmware update, I copied the new map and poi files to their correct folders and the they worked correctly.
Almost forgot... Make sure you back up before you start. You need the backed up files for the firmware upgrade anyway. Since they did a lot of construction in the Pittsburgh area, it's awesome that it doesn't look like I'm driving through someone's back yard now. ...lol