Originally Posted by Mahidi
Yes i can ,using the 3.55 downgrader. Yesterday i downgrade my ps3 from 4.20 dex to 3.55 dex peek poke cus i cant play multiman games on 4.20 dex..
and yeah why my ps3 always says update to 3.40 or later(even i was in 4.20 dex) in XMB update and also in recovery 
Believe it or not i think i am also surprising what is happening to my PS3,,
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Make a dump of your ps3's flash and post it online, then pm me a link to it.
I will verify for you exactly what is going on but I need more info.
What model is your ps3?
Don't tell me the hdd size, that is irrelevant, and is useless info.
If your ps3 is a phat it will have a label on it that says CECHXXX
If your ps3 is a slim it will have a label on it that says CECH-XXXXA or B.
No one can truly help you unless you provide this info.
Replace all X's with real numbers/leters.