8.6 to 9.0 failed database error

[fdoibz]

Hello everyone,

I tried to upgrade 8.6 to 9.0 in centOS 4 (big mistake)
Installer broke in the following lines:

version is 0860
DATABASE ERROR!!!
Previous product version is , but previous database
version is 0860. In most of cases it is result of
previous upgrade try failure. Please, restore previous version
from backup, and try again or contact technical support.

ERROR while trying to check database version

Aborting...

STOP psa-9.0.0-cos4.build90081117.17

Plesk is down and can't login.
I've tried pre9 convert, restore database and always get errors.

Any ideas to fix this?

Greetings.
Any idea how to get