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How can i see if i can jailbreak my ps3 system? I have read that you can see it on 0A or 1A or 1B or something, but i have bought the ps3 on 3.55 or an earlier version, i do not know it anymore. But i did the update to play online.. Can i downgrade it with e3 flasher??

If it had 3.55 OFW or lower when you bought it. Then yes you can downgrade