6876 seems to be your code for this serial number... do you have a picture with the radio label, BP234621250561 it may not be correct ?
https://fordradiocodes.online/unlock/complete/BP234621250561-dQ
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Try here mate, maybe its less expensive - Nissan Radio Code, for blaupunkt radios it's free to calculate your code here - https://fordradiocodes.online/