what is the vBulletin upgrade script?

[editor123]

what is the vBulletin upgrade script ?
I have this error:

You may have uploaded vBulletin 3.6 files without also running the vBulletin upgrade script. If you have not run the upgrade script, do so now.

thanks a lot

[cono1717]

In your address bar enter http://YOUBOARDLINK/install/upgrade.php

Then follow the instructions.

[editor123]

thanks cono!
i've already resolved it...

then now I have an issue with simbols ? and á ... i've tried everything, how can I fix this??