RNS510 FIRMWARE UPDATE?

I HAVE A 2009 GTI WITH RNS510

I DONT BELEIVE THE SYSTEM HAS BEEN UPGRADED SINCE COMING FROM FACTORY SO I WANTED TO UPDATE IT

IS THERE ANY SPECIFIC VERSION I CAN UPDATE TO OR CAN I JUMP TO THE LATEST ONE POSSIBLE?

ALSO WHAT IS ACTUALLY DIFFERENT? WHAT DOES THE FIRMWARE DO?

THANKS