You can simply install rogero v2.03 from xmb. Your psn games will have to be resigned while ps3 games might still work, even though mine didn't.
If you downgraded your console you still need to dehash maybe. I always recommend to run the toggleqa.pkg before installing 4.30 anyway.
As well as making the flash dump and backing it up. And also not to have a disc in the player during the update process.
Check the md5 and rename the pup properly. I know all of this may sound complicated to you but it's not.
All is explained in the tutorials here, all the information is there. Further doubts we're ready to clear up