(adsbygoogle = window.adsbygoogle || []).push({}); How do you downgrade from the newest OFW to 3.55 ??

i don't think that is possible withou lose all files

You can use an E3 Flasher But it depends in wich ps3 model you got.

You can downgrade to 3.55 by buying a E3 Flasher (But that involves taking apart your PS3)
You are probably better off buying a jailbroken PS3