I rechecked the system, and the original cd has the following inscriptions on it:

"2002-2 BMW Digital Road Map Germany"

I checked its contents and it nothing to do with what we are talking about: Instead of NAV_SW, it's called NAV_DB, with a TPD folder in it.

Could it be that the "3-2/50" legend is not the version? In fact, it's not on the top right, but rather on the lower right, of a function "SET" that belongs to the trip computer