You May Still Use Wotan.
Download WotanClient From Online de-branding and software upgrade service SonyEricsson (SE) mobile phones | WotanServer.com And Let The Client Update.
Now Clear The User And Password Fields And Hit Start.
Then Plug Your Phone By Pressing 2+5 Keys Instead Of c.
In 11 seconds, Your EROM Will Be Updated And Your Phone Will Most Probably Work.
Then Reflash.
See This Guide For Reflashing XS++ 3.1 Guide-Flashing,Customizing,Recovering - Top Sony Forums