Importing iPhone Contacts

I am writing from Switzerland. I own a Toyota Prius 1,8 CCTi S.Pr. Limousine. I have a problem with importing the contacts from my iPhone into the phone book of the car. Basically, the import stops after having imported the first 500 records, while I have about 2,000 on the phone. I have tried to do the import via USB and also via Bluetooth, but the result is still the same. The version of the software I have in the car is in the below pictures. Has anybody encountered the same problem? If yes, were you able to resolve it (please explain how)? I have managed to export the phone book to a .vcf file, but then I do not know how to import the same in the car. Any help will be greatly appreciated. Thank you and best regards.