I DON'T CAUSE ANY BRICKS OR WHATEVER. USE ON YOUR OWN RISK.
Downgrade with this:
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After that use this :
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1. Download the first file and rename it to PS3UPDAT.PUP and use it. Put the PS3UPDAT.PUP in folders like this:
PS3>UPDATE>PS3UPDAT.PUP
2. After you're on 3.55, delete the old PS3UPDAT.PUP and replace with the second file ( Rename and put in folders again ) and use it.
3. Done