2001, I'd asume you have a mk3 mate, (unless someone has swpped it for a mk4)

Press menu and then set (or settings), in the top right hand corner will be some numbers like 3-1/63 or 4-1/00 this will tell you your OS version and the nav computer type.

3= mk3 and cd based
4= mk4 and dvd based (it will read cd's too).

/63 is the last for the mk3
/00 (as in 100, or 10.00) is the last for the mk4.

Any v32 disc will update either nav computer to the latest version of OS, if you download (as opposed to get one from the dealer), then make sure its a mode2 disc image.

HTH

__________________
Sept 03, M3, Silver Grey. Retro-fits: Modded Mk4 DVD Drive, OEM Bluetooth, VR Control, Rainbow Speaker Upgrade, Sony SOT Amp, HK Sub, CCFL, Intravee II, NightMode.