Helo I have base system 4.0.0.0 installed.
I m using linux operating system.
right now I have following packages are installed

ADMIN-4.0.0.0
DBASE-4.0.0.0

I want to make my system 4.1.0.0

for this I upgrade the above packages to ADMIN-4.1.0.0 and DBASE-4.1.0.0

now I want that when Uninstall 4.1.0.0 then I got the my base system as
4.0.0.0.
how do I achieve this.

If I erase the upgraded above packages then how i got the original packages

Regards,
Amit