Old library from Zotero 1 cannot be seen after the back up folder is returned

I back up my library from the zotero file directory:
zotero.sqlite,
zotero.sqlite.bak,
storage folder

After downloading and installing the version 2, I put the three above into the new zotero folder (together or side by side with other files and translator folder).

But I still cannot see my old library on my Zotero 2.

Thanks for help.
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