All Possible Ways to Downgrade.

Just wondering can I downgrade my PS3 Datecode A1 running 4.31OFW without an E3 Flasher? Or can I Jailbreak 4.31?
I want to make Backups/Mods of a game that is Copy Prohibited & The only way is with to FTP them too my PC. I need to install the PKG Files and to my knowlage the only way to Install PKG Files is with a Jailbreak.

I've also heard that apparently all Jailbreaks after 3.55 are NOT Legit
True of False?

Thanks in advance, Please Answer as I'm willing to do anything to do this by this upcoming week. I just don't know how safe E3 Flashers are....

Finally will this work?;
Topic Name: QA Flag Downgrade Tutorial 3.55 Below [NEW]

If it can be downgraded (check here: SKU Models - PS3 Development Wiki), then you will definitely need a hardware flasher. There is no software downgrade for 4.31 OFW.

Any jailbreak that claims to be for OFW 3.55+ is NOT legit.

On the third question about 'QA Flag Downgrade Tutorial 3.55 Below'. I'm not sure what you are referring to, but I'm sure it won't help you downgrade form 4.31 OFW (see my first sentence).

can't be done without an E3 Flasher, you need to downgrade be on firmware 3.55 to be able to install Custom Firmware which will allow you to do all of the above

E3 Flashers are safe if you know what your doing.. i used this downgrade service on ebay [type] PLAYSTATION 3 DOWNGRADE SERVICE TO 3.55 if you message them and ask them to put CFW on your ps3 they will also do it for you :D

Although I've never had to downgrade, my feeling is that it's best to seek a downgrade service rather than try to do it yourself.