How to add cust pack to w580 with XS++ 3.1?

I finally got it all, thanks.

Finalization = Completing flashing operations and storing basic settings that phone needs to properly operate [i.e. security certificates, (and this is why phone displays "configuration error" if it is not properly done)].

Look here:

XS++ 3.1 Guide-Flashing,Customizing,Recovering under Customizing your phone.

Nice day