Default [Q] Tipo Dual - Not able to install application on External Memory Card

Dear All,

I have Tipo Dual mobile and as i said am not able to install application on External Card. For the same i read other threads of with that i am able to know that my phone must be rooted.i done same with UnlockRoot application. Once i rooted the phone automatically SU (Super User) application installed. Now when i trying to copy the vold.fstab OR change the content, its not allowing me to change or copy. when i am checking in SU log its saying that PRO version required.

How can i do without PRO version? as i see in following thread that so many people did it without Pro version.

What am missing not able to understand. can anyone please help!!!