Work In progress (only contains very basic info, more being added) Current Status Required Firmware & PS3 Model Is Downgrading an Option? Performing a Downgrade F.A.Q. Highest Exploitable (OFW): 3.55 Official Firmware Exploitable Firmware PS3 System Firmware: 3.55 - This Official Firmware has the ability to install Custom Firmware (CFW) . Which CFW is always consider the as good as it gets when it comes to exploits and running unauthorized code. My console has an official firmware installed that is higher then 3.55 what can i do? Well, you may or may not have options. This depends on your console's model and then if you do have a downgradable model the process will differ on if your console has a NOR or NAND chip. Downgradable Models - These models can be downgraded back to version 3.55 and then a CFW can be installed' FAT MODELS CECHAxx - NAND CECHBxx - NAND CECHCxx - NAND CECHExx - NAND CECHGxx - NAND CECHHxx - NOR CECHJxx - NOR CECHKxx - NOR CECHLxx - NOR CECHMxx - NOR CECHPxx - NOR CECHQxx - NOR SLIM MODELS CECH-20xx - NOR CECH-21xx - NOR CECH-25xxA or B (with date code [0C] [0D] [1A] ) NOR All other models can be verified with MinVerChk (<--- DL link needed) this will show the factory installed firmware which is the lowest firmware that can a system can be downgraded to, if this reads 3.55 or below then you system CAN be downgraded if this reads 3.60 and above this sadly means you CANNOT perform a downgrade. Models that cannot be downgraded / Exploited with CFW - These consoles comes with a factory firmware higher then 3.55 and have changes preventing CFW installations SLIM MODELS CECH-30xx CECH-40XX All Super Slim Modes Additional details about each console can be viewed on the Ps3devWiki that is packed with tons of information to learn more about these consoles by model checkout this link How to Downgrade my PlayStation 3? that has at least a 3.55 Factory installed firmware There are various well written guides around the scene and some great members around the community who frequent these forums as well. If you have questions this is the right place to come, but when asking questions and expecting answer's. The people giving you those answer's expects you to do a bit of research on your own but these guys and this guide will help lead you in the right paths Great Downgrading Tutorials Chapter I - PS3 Downgrade General Information (by 3absiso (psx-place) ) Chapter II - Hardware Needed for PS3 Downgrade (by 3absiso (psx-place) ) Chapter III: NOR Downgrade - Teensy Flasher (by 3absiso (psx-place) ) Ultimate Fool Proof Guide: Ps3 Hardware Downgrading (by baileyscream (from ps3hax)) Additional Links PSX-Place.com - Downgrading Support / Info Forum PS3DevWiki - Downgrading with a Hardware Flasher Frequently Asked Question about PS3 Hacking & CFW Installation Can I perform a downgrade (from OFW) with only Software? NO, A Downgrade from Official Firmware can only be done via a Hardware Flasher (see more information in the "Performing a Downgrade" tab of this post) Posted threads of FAQ: . . . . . . More Coming Soon in the meantime, Have a question post in the comments and someone will be more then willing to help .