Every Renault Car has unique Authentication Key. Generally when the battery is disconnected then this Unique Authentication Key is asked to be punched in.
Suggest to check Media Navigation Manual & Car Owner Manual as given
Generally the authentication codes, key numbers are mentioned in it in the service booklet
if the dealer has mentioned Radio Code in it at the time of taking delivery, it would be a unique 4 digit authentication Key of Music System
Else - You may contact in your Renault Dealer and share in your Car
> Engine Number
> Chassis Number
or visit them . Probably - they can assist you (based on Engine-Chassis Number of car to identify Authentication key) or they need to punch in unique music system serial number in the Software - basis which the authentication key can be found.
Hope should help in !!