SEPM 12.1 RU1 MP1 ins not sync with the SEP 12.x

Dear all,

I have SEPM 12.1.1101.401 RU1 MP1 server console, Then we have SEP 12.1. RU1 mp1 /12.1 version is already in some of the client machines.

What the issue we are facing means, the client machines (which is in SEP12.1) is not getting an update from the server, not sync with server also.

Note : with out uninstalled the client software.We will do the updation.

If it is possible means please share that information with me. 

Regards,

Saravanan