How to change database back to what it use to be?

[محروم.كوم]

Hello all* I am trying to downgrade my version back to 3.8.4 to a more stable version.

I am stupid* I did not backup the database.
After deleting all files in FTP I put the 3.8.4 files back in the FTP.

Now when i go to control panel I get this error:

Database error in vBulletin 4.0.0 Beta 3:

Invalid SQL:

SELECT COUNT(*) AS count
FROM attachment AS attachment
INNER JOIN post AS post USING (postid)
WHERE attachment.visible = 0;

MySQL Error : Unknown column 'postid' in 'from clause'
Error Number : 1054
Request Date : Tuesday* November 17th 2009 @ 05:15:57 PM
Error Date : Tuesday* November 17th 2009 @ 05:15:57 PM
Script : http://47r-squad.com/forums/admincp/index.php?do=home
Referrer : http://47r-squad.com/forums/admincp/index.php?do=home
IP Address : 75.42.21.123
Username : IcEWoLF
Classname : vB_Database
MySQL Version : 5.0.70

Trying to covert the database back to 3.8.4 Patch 1* is this possible? __DEFINE_LIKE_SHARE__