Non unicode - unicode instance problem

Hi experts,

I installed a new SAP ECC 6 Unicode and I have an ECC 6 non-unicode system. Now I want to update my
new system DB taking the DB from the old system but I got some problems because of the data type. Is it possible to do this?

The way I want to do it is using a backup-restore, in fact the restore process finished ok but my SAP instance does not start.

By the way this is my plattform:

New installed system                Old system        

  SAP ECC 6 Unicode              SAP ECC 6 Non-Unicode

  MSQL 2008                            MSQL 2005

  Windows 2008 server            Windows 2003 server

I’ve read some post and notes but anything seems to work for me.

Any idea or suggestion will be appreciated,

Ruben