How to downgrade db2 9.5 to 8.2

[Hozkr]

I have a problem.
I'm a beginner in db2 and urgently need to restore a backup made in the 8.2 version when I have the version 9.5.

I need your help because I have little experience and not what is the proper procedure, I have thought to uninstall 9.5 to install 8.2 and then make the restoration

Thanks for your help