Sony just released firmware v3.55 for the PS3, which only comes with a security patch--essentially blocking the current downgrading method that was possible on v3.50. Upgrading to this firmware will block your ability to jailbreak and/or downgrade your system. So, DON'T DO IT!
Note: Greg, from ps3-hacks said that you can still access the Service/Factory Mode using the E3 Card Reader USB device, but the downgrading option is blocked when used with PS3 firmware v3.55. Ouch!
Greg says:
"Update: It’s out and it’s mandatory — you cannot log in to PSN without updating to 3.55. It’s a mega small update too. Downloaded in mere seconds. Update wisely.
Update: So far I’m still able to enter Factory/Service mode with E3 Card Reader (programmed with E3 Downgrade software).
Update: But! Before I attempt a downgrade I’ve learned to backup my saved games… Cool, I’m still able to get back into retail mode using the 2nd Lv2diag.self file. Wait! WTF?! GT5 Save Game Lock: Copying Prohibited. I can’t backup my GT5 saves? Weak.
Update: Looks like they’ve patched it… You’re still able to put the PS3 in Factory/Service mode; however, step 5 to 10 (referring to the tutorial here) is a no go. The system continues to boot into Factory/Service mode, even with the modified 3.41 PUP and the first Lv2diag.self file loaded alone on a USB drive. Fortunately the second Lv2diag.self works and returns the PS3 to retail mode. So in other words: you cannot [currently] downgrade from PS3 firmware 3.55. Well, at least I never lost my GT5 save. Back to it!"
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