Cant erase saved data from previous owner
 

Hey guys , im new to the forum. I just picked up a 2009 370z , and i can't seem to erase the data from the previous owner, such as his bluetooth phone , nav address book , etc. I have the stock nav system. I can delete them and store new info , but when i turn on my car and turn it back on again , its back to the previous owners saved info. Is there anybody that has had this problem ? Is there any way i can format everything ?

Thanks guys ! :)