Upgrading Maps On Rns510; Do I Need To Upgrade Firmware? Options

[roym]

Hi folks, long time away, back again.

Have an original VW RNS510. I think it's version 6 or 7 maps. Bought from ebay about 6 years ago.
Was advertised as
"Version B, SW Version: 2760, Will fit cars with old CAN Gateways and will not cause battery drain. Video in motion activated"

Since I got it I changed the splash screen to the SEAT version (it's in a 2010 Leon FR, previously had it in a 2007 Leon Stylance). It displays SEAT service centres on the POI not VW! Not sure if this is because of the car it's in or the change to the screen.

Just did a check on the hidden service menu, details as follows,
Delivery Part No. 1TOO35680C
HW Version H04
SW Version 2760
Map West Europe Navteq
Map Version 7333
HDD ST Number Partitions 2

If I want to upgrade the maps to V9 (2013) can I do it straight or do I need to update firmware? I understand I may not be able to get latest maps (V15) without firmware upgrades but I'm not sure about V9. I'd prefer to keep my SEAT screen, VIM and most important my 30 odd hours of music on the HDD. All advice appreciated.

Thanks,
Roy