Is it possible to keep emulators while upgrading back to 2.0?

I was wondering if it is possible to upgrade back to 2.0 while still keeping the emulators. If it is, how exactly do you do it? I am only interested so that I can ply several of my PSP games online and so I can use the emessenger services.

Thanx!!!

Also, Is it possible to have more than one emulator on one memory stick?

yes.

but if you want to be able to run the emulators,

your probably gonna have to use the fanjita loader.

and you will still be able to do all that other stuff, browser, psp games, bla...