Unhappy [Q] Screwed up installing CM 10.2

I did backup everything using Rom manager before installing CM 10.2.
wen the new rom was installed all ma data and apps were gone. i installed the rom manager again from play store and opened it and i could find inside restore option and my backup file was der. but everytime i try to restore it i get the msg md5 mismatch.
the worse thing is in my internal storage all the space occupied before is still der but inside der is no data.
Checked the forums before and i saw that i have to open the backup folder in my storage and solve with it, but the problem is those folders arent available wen i search for it in the file manager guys help pls