Cannot change country

When you connect your TomTom (using the TomTom HOME application on your computer) ... and you sign in to your TomTom account, it will automatically do a scan/search to see if there's any update(s) for your TomTom device.
If you see the an update (available) for your Navigation software, select it and proceed to download and install it. MapShare updates are also identified and can be selected, downloaded and installed (free).
If you're asking whether you can update the map free ... the answer is NO ... not from the TomTom website. You'll have to buy a map update (subscription) and download the new version of the map and install it.

register the device, tomtom home will reinstall the original map that was on the unit when new

It usually finds and updates whatever map(s) you currently have on your GPS device. However, if you have a few maps, it may offer you options to buy more (maps) ... as one or more updates ... for one or more additional charge.

You may be able to get "free" map updates from (illegal) underground sources. But that's not recommended.
Yes, you're right, you can simply get a new TomTom GPS and get the latest map(s) for it. Consider getting a TomTom with lifetime maps ....and you won't have to pay for any map updates.

Tom do not seem to overwrite the existing map file. So before trying to install the map, you need to delete the folder that contains the map. (It is important to read the next part before you delete the map folder). Once you have connected your TomTom to the computer, close the TomTom home window. Double click on my computer. You will see the TomTom hard drive as a drive (like you see the CD drive). Double click on that . Once the folders of the TomTom hard drive opens, look for a folder named USA_Canada_and_Mexico_P. (Please note: this name is for American continent. For others, this name will be different). Right click on it. click properties. Check whether the size of this folder is approximately around 1.3 GB to 1.5 GB. This is just to make sure we have the correct folder. After confirming this is the map folder, copy this folder to your computer for back up purpose. Once you have it safely in your computer, delete this folder from the TomTom hardrive. Go back to TomTom homesoftware. Use the map guarantee to update/Upgrade the new map. You will see this time around the installation completes without a problem.

Go to this link for detailed instructions on the Tomtom site.

http://uk.support.tomtom.com/cgi-bin/tomtom_uk.cfg/php/enduser/std_adp.php?p_faqid=5169&p_created=1150209083&p_sid=5WnnuOUj&prod_lvl1=141&prod_lvl2=1682&cat_lvl1=2353&p_accessibility=&p_redirect=&p_lva=&p_sp=cF9zcmNoPSZwX3NvcnRfYnk9JnBfZ3JpZHNvcnQ9JnBfcm93X2NudD00Niw0NiZwX3Byb2RzPTE0MSwxNjgyJnBfY2F0cz0yMzUzJnBfcHY9MS4xNDE7Mi4xNjgyJnBfY3Y9MS4yMzUzJnBfc2VhcmNoX3R5cGU9YW5zd2Vycy5zZWFyY2hfZm5sJnBfcGFnZT0x&p_li=&p_topview=1

No Maps Found usually means the Application on your internal memory is not the latest one, or the map did not download correctly.
Make sure when you select internal memory when updating your device on home, that you update the application as well.
V8351 should be the latest application for your device.

Power up yout tomtom

Tap the map screen to bring up the options menu

Then tap the spanner / wrench icon

Use the right arrow to scroll until you see Manage Maps and

Tap that now tap switch map

Select the one you need and you may need to tap twice.

You have changed maps to the one you want.

If the map you want is not listed then you would have to purchase it from TomTom

hello again

its look like the chat has enden suddenly any way lets continue here after a giving blue feedack in the chat session/

after installing the utility
plug ur unit and press update.

you may have run out of memory for the full map, your device can use a 2Gb max SDcard which should be enough for all your maps. It will have put placeholder there and tryed to drop the full map but you can only see the bit it could store to the memory.