Hacking From 4.81 Dex/rebug to 4.82.. how and usefull?

[lafleche]

Being completely new to ps3 hacking.
I just bought a pre-hacked ps3 with rebug 4.81 dex/cobra 7.50 (so the console information tells me)

I connected a fat32 harddisk with games and it all works great.... the console is banned but I can't seem to bother to buy a new cid :-)

Now the question
Is it usefull -if possible?- to upgrade to a CFW 4.82 and if so : how and where to start.

regards