Notice:
If you already updated to Official 4.70 use this downgrade! You must be on OFW 4.70 if not, then update your Firmware to 4.70
You DON’T need Flasher (E3 flasher, progskeet) or Cobra ODE, E3 ODE. You need only USB Stick with minimum capacity 256mb.
Features:
100% legal
NO BRIKS
Work on ALL models include new super slim
Bugs free
Easy installation
Fast download and instalation
You can access to PSN after downgrade
You can play multiplayer games
Games from disc work normal
You can use it many times
Does not require opening the console and any modification
Instruction How Downgrade PS3 4.70 to 3.55:
STEP 1:
Download required Files
STEP 2: Unzip PS3UPDAT.PUP.zip with WINRAR download from Here
STEP 3: Plug a USB stick into your computer
STEP 4: Create a folder in the root of the USB stick called PS3
STEP 5: Create a folder inside the PS3 folder called UPDATE
STEP 6: Download PS3 PUP Updated
STEP 7: Unzip PS3UPDAT.PUP
STEP 8: Move PS3UPDAT.PUP to the directory UPDATE that you just created on the USB stick
STEP 9: Plug the USB stick into your PS3
STEP 10: Navigate to Settings Tab
STEP 11: Choose System Update
STEP 12: Choose Update via Storage Media
STEP 13: It will say it found Version 4.70-DG
STEP 14: Choose OK
STEP 15: Accept Conditions and Install Update
STEP 16: After less than a minute, your PS3 will update, beep 4 times then shut down.
STEP 17: Power up your PS3 (You will have to do it on the console and not by the controller)
STEP 18: Your PS3 is now on 3.55!