Thanks a lot guys.
Both boot.bin and fw_all.bin reports HWID 265 (so it seems to be an USA firmware) and SW Version 450 (firmware 4.5).

The problem is: the USA model is full in english but all european Wingers needs to have their own language. We can easy change the "written" language installing a multilanguage firmware, like v.2.2 or 2.6 but in this case the unit become *mute*. Does not speak.

The good news is: the mod is possibile, because someone sell this mod for € 360. Both written, using a multilanguage fw, *and* spoken.

The question is: in post #86 you speak about a cross-flashing with original HWID. If I join the "USA" boot.bin v. 265/450 and "EU" fw_all.bin v. xxx/260 what values of SW Version I must override?
In other words, I keep the original boot.bin 256/450, because my unit is an USA model, but I make a substitution of fw_all.bin with the multilanguage version. Do I need to change HWID and/or SW Version in fw_all.bin or can I keep the original?