Forum Wrong upgrade URL, cannot continue upgrade process.
 

My forum right now is using version 4.0.3.
Before, I successfully upgrade the test forum, from 4.0.3 to 4.0.6..

But, when I want to upgrade the real forum, i'm doing it without guide and backup. :(
Instead go to http://www.example.com/forums/install/upgrade.php, I go to http://www.example.com/forums/install/finalupgrade.php.

After the process is finish, it bring me to the ACP, and the version is still 4.0.3.
And, when I realize I do the wrong step. I try to upgrade again using http://www.example.com/forums/install/upgrade.php.
But, it's still give me the same result. The upgrade, wont continue to upgrade to 4.0.4, 4.0.5, or 4.0.6..

When I manually use this address: http://alssunni.com/install/upgrade_404.php
it still brings me to: http://www.example.com/forums/install/finalupgrade.php.

Is there anything I can do, to fix this error?
Thanks.