[Zope] Migrating to Zope2.3.3

Hi I have installed Zope2.3.3 & ZEO1.0. I would now like to move the Data.fs in my old Zope installation(2.2.4) , which has CMF0 0.10alpha, to the new Zope installation. Earlier, I had copied the Data.fs, Data.fs.lock, Data.fs.tmp & Data.fs.old to the "var" directory in "Instance_home" of the new installation. But it resulted in a datacorruption error. So I have redone the Installation & would be thankful if anyone could please tell me the process of migrating the Database to Zope2.3.3. I have custom_zodb.py, zope.conf & zctl.py in my "Instance_home " directory & the ZEO in "lib/python" under "Zope_software_home". Thanks for any help. Priya.