Restoring Sophos45 on Sophos50 database

hi, 

i recently  installing a fresh SEC 5.0 on my new server. 

the installation in success, with a new SOHPOS50 database of course (download also completed via the internet).

next phase:

import database from my pld server SOPHOS45.

i run restoredb.exe d:\sophos45.bak .\sophos sophos50 -->resulting the SEC now cannot start.

i've been walking around to find how to manage upgrading the database SOPHOS45 directly to 5.0 without affecting my old server.  so i tried to firstly :

- restore SOPHOS45.bak to mssqlserver,

-run upgradeDB.exe -debug -sourceVersion=45 , from ny new server, it said complete. but the database still empty.

i have also found an article said that the UpgradeDB.exe looked up to registry HKLM\software\sophos\ee\management tools\databaseconnectionMS

so i edited the key from SOPHOS50 to SOPHOS45, and SOPHOS47

niether works.

i need help.

thanks for any help.