tried this, using using same japan 1480-v3.60, modded using my eu version 5.80
I have EU-italian 1390T

Voice (italian) not working (as expected??). Need to pass through voiceeditor.

Menu shows TV icon, not working because 1390 does not have tv module.
Bluetooth is working only for dialing, not for internet connection.
It has route enabled.
It has a couple of icons in where to go not useful for EU: prefecture (typical Japanese), Exits (what??), Google (not working because of dial-up problem)
Pedestrian mode has been substituted by truck.

Someone knows how to gain internet access via DUN?

I will try some other fw, jap and cn.