How can i downgrade mysql to previous version ?

[öndere]

I am using plesk 10.4.4 - centos 6.2 with mysql 5.5.20 but i want to use mysql 5.1.61 (or lastest versions of 5.1 x) instead of 5.5.20 so how can i downgrade mysql?

 

[IgorG]

I think that better solution would be installation new Plesk server with necessary MySQL version and migration to this server. MySQL downgrade is really vexed procedure.