[HowTo] Password Change Roundcube 0.5 (and 0.4.2)

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Password plugin just DOESN'T WORKS. None of all version posted in this forum works with the latest ispCP Omega and roundcube. Any one got working version? I can't make it works, the best state a got is "password saved successfully", and i can see in the sql debug query that it is REALLY updated in the mail_users table, but after logout, the password isn't really changed. I think there must be some command adressed tot he ispCP omega API, that will update the password, but im not a php developer.