One of my sites (http://nosikov.ru/freeaudio/) was at 2.2.3 version.
From one moment it started experiencing troubles (warnings, not being able to log in etc)
I decided to upgrade to a version 3 as my other sites work well on it.
I read and followed the procedure at Codex.
But as I fail to log in as an administrator database is not upgraded (see errors at http://nosikov.ru/freeaudio/wp-admin/upgrade.php?step=1&backto=)
The same happens when I try to update to a 2.9 version.
I can login as administrator at a 3.0.1 version but can't update a database.
What can I do finally upgrade it?