If you're asking...
How to Downgrade PS3 4.66 firmware?
PSDowngrade is now updated for the newest PS3 firmware 4.66. You Now have two options open to you and still remains the ONLY solderless downgrade solution. No need to mess around with or NOR or NAND flashing!
Either downgrade ps3 to 3.55 OFW and install the 3.55 PS3 CFW or install the newer Rogero CFW 4.66 which will give you access to the latest games and online access (including the store). However the 3.65 CFW at this time will not run much of the older homebrew such as emulators and games. Choose the correct PS3 Custom Firmware depending on your needs for the console.
How to downgrade PS3 firmware 4.66 to install an older version?
Download the required files HERE place them onto a usb memory stick and update as normal. This will place your PS3 into service mode which will allow you to install older firmware (or even CFW).
All files required can be download HERE
Working on all firmware revisions up to and including 4.66. Also now fully tested on 3k and 4k PS3 systems including the new Super Slim PS3. Now for the first time ALL PS3 users can enjoy homebrew and game backups without the need for anyh expensive dongles or hardware flasher.
INSTALL INSTRUCTIONS (UPDATED April 2013)
Step 1 – Download PS3 downgrade PUP file and place on a USB memory stick in the folders PS3\UPDATE
Step 2 – Switch off power to PS3
Step 3 – Turn on PS3 and keep your finger on the power button though the beeps until it turns off again
Step 4 – Press power button again and hold it until you hear 2 quick beeps together then release button
Step 5 – Playstation 3 will now be in Recovery Mode
Step 6 – Choose update from storage device / usb and let PS3 update
Step 7 – You will be prompted when it is finished to insert usb with required firmware on
Step 8 – Copy the PS3UPDAT.PUP file for the jailbreak firmware you want (usually Rogero) ) to the PS3\UPDATE folder of your USB
Step 9 – Choose update now... wait... and your downgraded!!!
This is the Only Way How to downgrade ps3 4.66 at the current time. If you are looking for a tutorial on how to jailbreak 4.66 then that is not possible without downgrading first.
ORIGINAL SETUP INSTRUCTIONS NOW DEFUNCT ARCHIVE COPY ONLY
Step 1 – Open PS Updater application that install a shortcut on your desktop
Step 2 – Plug in PS Jailbreak and click My Serial (make sure it can recognize and find your serial number)
Step 3 – Click My coupons and enter the coupon code you received from your authorized reseller when purchasing PS Downgrader.
Step 4 – Save the download it prompts you with ( You will receive 2 files , a) Program (which is PS Jailbreak) and b) Downgrade (which is your downgrader)
Step 5 – Go install file choose the Downgrader file and click Update now
Step 6- After using PS Downgrade to lower your firmware please follow the above steps this time choosing to update file a) Program
Step 7 – Now your USB is back to a Modchip
requirement – PS Jailbreak USB Dongle , PS Downgrade Coupon that has been installed onto your PS Jailbreak Device, Modified 3.41 PUP , LV2Diag.self (file 1) and LV2Diag.self (file 2)
OLD DOWNGRADE INSTRUCTIONS
Step 1 – Insert USB device that has been reprogrammed as PS Downgrade into your console
Step 2 – Turn on console using same boot method as PS Jailbreak – Press Power then immediately press eject. You will see your console turn with PS Jailbreak lit up with red/green light followed by green only, Then it will turn off.
Step 3 – Turn on console to make sure you are in factory service mode. You will see a huge red box on the screen saying Factory Service Mode, once confirmed please turn off console and remove PS Downgrade Dongle
Step 4 – Program any blank usb with 2 files , A) modified 3.41 pup B) Lv2Diag.self (file 1) These must be the only files on the usb key and must be placed in the main directory of the flash drive.
Step 5 – Insert this new Flash drive into the right USB PORT of your console ( It must be placed in the outermost right port) and turn the console on. You will see black screen but you will see flashing lights on the console (yellow) and on your USB key
Step 6 – Wait 3 minutes for the system to install the old FW, towards the end the power button on the console will start flashing green and then your console will power off.
Step 7 – Remove the usb key and turn on the console , you will still be in factory service mode. Please verify you have downgraded successfully to version 3.41
Step 8 (Optional) – If you wish to downgrade to any older firmware you can not follow step 4,5,6 using any regular firmware PUP. (You do not need to use modified custom firmware now that you are on 3.41)
Step 9 – Insert flash drive back into PC , remove the PUP and Lv2Diag.self and install only LV2Diag.self (file 2) on the USB Flash Drive
Step 10 – Power on your console, after 10 seconds it will power off
Step 11 – Turn on your console with no USB inserted and you will be out of factory service mode into retail mode with your chosen firmware version installed.
JAilbreak your console and enjoy playing homebrew