I'm not sure if this thread is the best place to post this, but Negamann's tutorial was a lifesaver in getting me through the upgrade.
Since then, I've had trouble using ICS to tether my pc using the XV6900. I have the "unlimited data" add-on to my Verizon plan ($39.99/mo) but was unable to tether without running into the VZ Access Manager roadblock. Thanks to Magicality's help, I can finally connect using this fix:
Dial ##778
Select edit, enter 000000
View Info -> M.IP Default Profile
Change DUN NAI to
yournumber@vzw3g.com
View Info -> Security
Change S.IP DUN User name to same as above (yournumber@vzw3g.com)
Menu->OK-> Let it soft reset
Now connect your laptop or pc with the usb cable, select Programs> Internet Connection Sharing and surf away!
Again, thanks to Negamann and Magicality for sharing their wisdom with us rookies!