Originally posted by another user
You can't... Plain and simple. You can't downgrade to 3.55/3.41 unless you have one of those Infectus NAND chip that are godawfully hard to install and no one knows how to use. The only thing you can do is buy another PS3 and hope it's on 3.55.
Yes i know its hard :p
but after i installed it i really love it =D
But thank god its hard now not every noob can do it