Many sketchy websites offer paid downloads or malware-infected ISO files. Do not pay for firmware. It was released by Volkswagen for free (via dealerships) and is now maintained by the community.
Press and hold the SETUP button for 10 seconds to access the secret Testmode menu. Check the "Delivery Part Number" and "HW-Version" before downloading anything. Rns 510 Firmware 6270 Download
Includes support for Radio Text (FM), larger SDHC cards (up to 32GB), and speed limit displays. Check Your Hardware Compatibility larger SDHC cards (up to 32GB)