I downloaded the US-Canada map update and now i turn my TomTom on and it says i cant us that map and now i cant even use the device is there someway i can restore the device back to default?

plug into a comp that is online and go to tomtom site to find out

If your TomTom GPS model number (when you originally purchased it new) is shown with an "M" ... e.g. GO 730M ... it indicates that the TomTom GPS unit you'd purchased includes free lifetime maps (updates) just for the map included in that unit, e.g. USA and Canada. If it shown with a T, e.g. GO 730TM ... it indicates that it also includes traffic data.
When you register the unit (on the TomTom website), and you log in to the TomTom website (using the TomTom HOME or MyDrive Connect), it will (automatically) tell you if/when you have an updated version of the map to download, to replace the current one on your device.

That is really strange!
I can only suggest that you verify what MAPs are physically on your TomTom device by connecting it to a PC/LAPTOP and use Windows Explorer to look at your GPS drive folders: should see a folder for each 'country' (like GUAM).
The normal way to check which maps are registred and loaded on your device is to use TomTom Home -> Update maps function: it will show you the status or whereabout of any Maps that you have loaded or backup and which one can be purchased.
Hope it helps: let me know how you go.
ps.i f you wisely backup your device on a regular basis (via TomTom Home or direct copy to your PC/LAPTOP), you could always RESTORE FROM BACKUP and start again.

I would suggest you to look into Underground GPS forum. It has some good info. TomTom official site is not the only way to get and update maps on AVN2210P. Currently I am using version 840 latest USA and Canada map with Navcore 7.833 with no issue. Good luck.

Yes you can I have europe and canada on mine.

just plug your tomtom into your computer and start tomtom home

On the computer screen for tomtom select ADD MAPS

Here you can select and buy the maps you need.

Once you have confirmed the purchase you will be given instructions on how to download etc

Some maps may take a little time to install to the tomtom itself.

you should also ensure there is enough space on your tomtom
If not you will have to get an SD memory card.

I use a 4gb one that still has lots of room to spare

You have the option of unchecking items you don't want installed and updated every time you connect to TomTom Home. Reset the entire unit and update again to fix the error

Yes, this is possoble.

Make sure you:
- Have updated to last navcore v7 version
- Have updated TomTom Home to latest version

Then buy and upgrade map through TomTom Home...

Find latest version of TomTom Home here:
http://www.tomtom.com/support/support.php?ID=3&Language=1

This TomTom comes loaded with 2 maps....Guam and the US with Canada. I too got stuck in Guam and it is not obvious how to get out of it. But here it is.
Go to Main Menu, then Change Preferences
Hit forward arrow twice
Go to Manage Maps
Hit forward arrow once and choose Switch Map
It should show you Guam and the US and Canada
Tap US and Canada and it should take you out of Guam!!
Mine did and I am now going to delete the Guam map.

go to www.tomtom.com

download 'tomtom home' to your PC.

this program will allow you to update the OS & let you buy new maps camera warnings etc.

You can buy them in your local stores too.

sounds like you don't have enough space to download.