I am a newbie here, I've read alot of information and am still a little confused and wanted to update my RNS510. However I understand that what firmware you upgrade it to, depends on what firmware you already have? Or can I just download the latest firmware for all units as per the tutorial? My car was first registered in November 2007 on a 58 plate if that helps. I don't have this secret menu when you hold the setup button even for 1 minute, all that shows up is the radio selection AM/FM/DAB. I've not got a VAG COM or VCDS so any help is much appreciated.