downgrade php version 5.5.9 to 5.4 plesk ubuntu server

[Kelly1]

regards

I want to return the PHP version 5.5 to 5.4 while maintaining the operation of PLESK as I can accomplish this?
in VPS server folder find the following file:
/root/parallels/PHP_5.4.39/php54-5.4.39-ubt14.04-x86_64.inf3

This file serves me? as I can use?.

It's my first time with Plesk

thanks