[Zope] help! I'm locked out.

I had some trouble with security settings by default, 'cos they were set in rootdir... I wanted to change this, so not anybody could access all subfolders, etc... the PROBLEM is, I've gone to far and disabled all rights even for Managers... now, even my ADMIN account won't work... but I still got FTP access: is there a way, maybe via a Pythonscript, to change security settings, so that I can access the ZopeInterface again? or maybe via File system, I mean, the hard location of Zope... Please help me, all my code is locked within... Chris'