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Hi My name is ***** ***** I will try and assist you today.
I can suggest 2 things to try:
1. You can try and update the Software using this link: https://auto-update.garmin.com/auto-update/site;jsessionid=AEB7D96236EE0D873B16C3E34EB2F1B3. You will need a USB drive and to follow the steps given.
2. OR - You can try and reset your Vehicles ECU (computer). This restores your Vehicle to 'factory settings' and could restore your Nav without having to do step 1. You can do this by disconnecting the Battery terminals (positive 1st then negative - wait 3-5 mins, then reconnect terminals in reverse- Negative then positive
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Many thanks :)