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ethomaz said:

Only work with already hacked PS3 (before firmware 3.55)... so if you have a old PS3 hacked you can use the lastest firmware hacked.

That's not work with PS3 updated with official firmware > 3.55.


From what I've gathered you only need a PS3 that was manufactured when 3.55 has not been released yet.
Then you can still downgrade to 3.55 even if you had 4.X on it.
So still the vast majority of all sold PS3s are able to do this.