Yes, if you reset the device to factory settings, you will lose all your saved locations.
You must go to your TomTom account and change your email address in your profile.
But first, you must save all your locations to MyDrive.
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Managing your TomTom account
You can edit your email address, password, and postal address on your account details page . If you are not already logged in with your TomTom account, log in now. If you've forgotten your pass...help.tomtom.com
After saving all your locations to MyDrive, change your email address in your profile.
You must factory reset your device to change the email address on the GPS.
Yes, you must first log in with your old email account to change your email address.
If you can't, you must create a new TomTom account; you will lose all your saved locations.
If you have changed your internet provider, you have no choice but to create a new Tomtom account and associate the GPS with this account.
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