Can't get back to 3.55 from 3.21

I tried to Install Rogero 4.30 CEX v2.0 from 3.55 Kmeav, but there was some problem.
I tried to install 3.55 again, but I can't so this is what I did.

Rogero 4.30 > Rebug 999 > tried to get back to 3.55, but end up 3.21 (Don't know how, because I didn't used 3.21 FW)

Now I can't get out of 3.21. I tried to use OFW 3.55, but it still display as 3.21. Please help me out.