Error updating mysql

[gpantalone]

I would like to update Mysql on my plesk 9.21, from version 5.0.45 to a new one.

I stopped Mysql service, copied and renamed old parralels\plesk\datatbases\mysql folder, created a new mysql folder with the unzipped content of the mysql release.

However, as soon as i try to restart mysql service the panel shows an error message:

Error: Could not complete the operation: defpackagemng failed: The system cannot find the file specified. (Error code 2) at StartService 'MySQL'

Is there any other way to make this upgrade or to avoid this error? I tried with mysql 5.5.8 and 5.1.54

Thanks!

 

[gpantalone]

just forgot... of course I also copied the data subfolder from the old version to the new one, trnasfering the permission aswell