Why I am getting a Green Secure message on SATNAV

Hi

I have a 2004 Almera SXE. The radio button is not working and my satnav keep switching a secure message in green. I am unable to use the satnav for long periods.

how can I clear this green secure message?

I called Nissan and they want to charge me £114+VAT per hour to check it. It is a rip off!

please help me

thanks
Hansi
 
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