Hi Junaid ,
If you make your changes in TXN RZ10 and save it a copy of the current Parameters is saved in the /sapmnt /../../profile directory . You can also manually take a copy of the profile directory .
Incase you have issues in starting the system ,
1 ) backup your work folder
cp /usr/sap/<SID>/DV<>/work to /usr/sap/<SID>/DV<>/work.old [ This step is not actually needed .. but just for completness ]
2 ) revert your old profile
3 ) start SAP
4 ) Analysis can be done form the from the work.old folder
Thanks ,
Manu