Call Garmin support line for Garmin products only.
 Just be sure to have your GPS with you
while you're on the phone with them.
Try It. I did and they will talk you through how to do it. 
Tech Support Line ... Phone:
1-800-800- 1020 or 913-397-8200.  
This will surely help & Good Lucktoo! 
Prof. Ed 

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