Prompt [Q] How I can root Japanese panasonic (SoftBank) 102P

I am trying to root my Panasonic (SoftBank) 102P with Android 2.3.5

Been trying following
Errors: Shell-root could not be accessed.

Apps I have tried:
and some other...
Same error.

What to do?

I can not reach root, su or sudo through a local terminal in the phone.

Is there any way to do something like brute-force, how?
Any other tips?