Why are you doing this so complicated? There is a much more easier way:
-Install Desktop Manager version 3.6.2.9
-Download
3.7.1.41 from Rogers.
-Install version 3.7.1.41
-Close Desktop Manager
-After installation go to C:\Program Files\Common Files\Research In Motion\AppLoader and delete vendor.xml
-Start Desktop Manager
-Start AppLoader
-Connect your 6710 or 6720 with 16MB to your PC and click "Next"
-Follow the instructions on the pc screen and update your device
-Be happy