Since this is an australian forum I doubt maps for Italy are uploaded here.
However the procedure remains the same...
Italia 900.4608 would work with your current Navcore.
Use the lates version of FastActivate to patch your Navcore and activate the map - done.
If you want to try a Navcore with more features and support for full featured maps try the 9.458 I posted, the MB version should be fine for you.
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