How to jailbreak FAT PS3 80GB V4.3 OFW?

Hi,

1st of all, I'd like to say that I'm very new to these stuff, and I've been reading and searching about for only 2 days now.

My PS3 was hacked on V3.55 and I had Multiman V1.16, pretty old one. I searched online And I found that there's a newer version of multiman (V4.17 I think) and it works on PS3 V4.30.

Note: At that time I didn't know what OFW, CFW, and JFW were!!

So, I downloaded from my laptop the update V4.30 (obviously it was OFW) and updated my PS3 using my USB flash drive.

Then I downloaded Rogero V4.30 - V2.03, and while trying to install it on my PS3, it got stuck on 72% saying (the data is corrupted (8002F957))

It was then I did more research and figured that I updated to OFW 4.3 not CFW 4.3!

As I read more, There's a solution suggests to downgrade back to CFW 3.55 and then install the Rogero update! I could have done it when I was still on CFW 3.55 yesterday!

So, will you guys help me out? Is there any other solution than downgrading? Because I'll need to buy some hardwares, and I checked some links to know exactly which one supports my PS3 (NAND or NOR)

Thank you in advance.