OS = operating system of the mk4 nav computer

On the navigation monitor, press menu, then set, then look at the top right of the screen, it should have some numbers, eg; 4-1/91, this is the OS version number (not v32, this is the cd release number), if you have 4-1/00 then you are up to date, no update needed.

v32 (4-1/00) V32 for the mk4 (only) Nav compurter

Then use imgburn (The Official ImgBurn Website) to burn a new (blank) cd with the new downloaded OS image.

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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.