Needed files: PS3UPDAT.PUP ( new 3.55 version- Download link http://bit.ly/UCHRIj
Steps and Instructions:
STEP 1: Plug a USB stick into your computer
STEP 2: Create a folder in the root of the USB stick called PS3
STEP 3: Create a folder inside the PS3 folder called UPDATE
STEP 4: Move PS3UPDAT.PUP to the directory UPDATE that you just created on the USB stick
STEP 5: Plug the USB stick into your PS3
STEP 6: Navigate to Settings Tab
STEP 7: Choose System Update
STEP 8: Choose Update via Storage Media
STEP 9: It will say it found Version 3.55
STEP 10: Choose OK
STEP 11: Accept Conditions and Install Update
STEP 12: After less than a minute, your PS3 will update, beep 4 times then shut down.
STEP 13: Power up your PS3 (You will have to do it on the console and not by the controller)
STEP 14: Your PS3 is now downgraded !
PS: This works only with Official FW 4.31 !
PS2: A few models of PS3 doesn't detect the downgrade/update, if your console has this issue use this mini-tutorial to fix the problem ( http://www.mediafire.com/view/?balebeqr8x0poyb
With 3.55 you can easily JailBreak your console !
For any problem please contact us with a PM !