Just checked the twitter account, that guy was the one who made the prototype of rooting SH series phone, where the works from another guy. I also asked him rooting problem at twitter before. Thanks for sharing this news.
Successfully upgraded my SH-06E, and here is the new rooting tool, and it does work, just needs few more steps than before. http://worldtsunami.blog136.fc2.com/blog-entry-58.html
Seems 203SH still require sim card for update, so I failed at update screen.