Help with radio in a Renault grand scenic pleade

I have a 05 Renault grand scenic and recently had the battery changed. So the radio now needs a code to put in the security code is v178 so my code is 4832. After I put this in I press 6 to confirm but nothing happens apart from a beep. I'm currently half way through a car journey with 3 hours to go with 4 girls moaning as they can't listen to music. Any ideas what to do to get the radio working
 
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