I am trying to upgrade to a 2 gb. I have a 510 and I have the dvds. I saved the info. to the sd card. When I put in the sd card in the tomtom it says usa and cananda hasnot been activated. The tomtom says to visit www.ttcode.com to get activation code. It gives me the device code and when I go to the web sight and put in this info it gives me the code, but the tomtom willnot except it. Im not sure what to do from here.