PSP Custom Firmware Guide: PRO CFW & Infinity

The PlayStation Portable remains one of the most moddable handhelds ever made. Custom Firmware (CFW) unlocks ISO loading, plugins, homebrew, and region-free play — and on any PSP from the original fat to the 3000, it can be done without any hardware modification.[1] This guide covers installing PRO CFW 6.61 (the most stable and widely supported CFW for all PSP models) and optional Infinity 2.0 for persistent installation on PSP 1000/2000.

Understanding CFW on PSP

Sony's PSP uses a layered firmware system: IPL (Initial Program Loader) → IDSCORE → system modules. CFW patches intercept these layers to allow unsigned code execution.[2] PRO CFW achieves this through a chain of exploits: an initial kernel exploit runs from the XMB or a game save, loading the patched modules into RAM. On unpatched PSP 1000 and 2000 units, Infinity can write a permanent boot patch to flash, so CFW loads automatically without needing an exploit each time.

Step 1: Update to Official Firmware 6.61

PRO CFW requires OFW 6.61 as a base. Download the official EBOOT.PBP updater from Sony's support page and install it via System Settings > System Update. This is the final official PSP firmware and is safe to install on any model.[3]

Step 2: Install PRO CFW 6.61

1. Download PRO-C2 CFW from github.com/meetpatty/PROCFW (the community-maintained continuation)
2. Extract the archive and copy the PSP/ folder to the root of your Memory Stick
3. On your PSP, navigate to Game > Memory Stick and run CIPL Flasher (for supported models) or FastRecovery
4. The CFW will load immediately — look for the PRO version string in System Settings > System Information

Step 3: Make it Permanent with Infinity 2.0

By default, PRO CFW only persists until the PSP is powered off. Infinity 2.0, developed by TheFloW, patches the PSP's flash memory to auto-load CFW on every boot.[4]

• Supported on: PSP 1000 (all), PSP 2000 (TA-085v2 motherboard and earlier)
• NOT supported on PSP 3000 or PSP Go — use FastRecovery instead, which re-applies CFW in about 3 seconds
• Download Infinity from github.com/TheOfficialFloW/Infinity and run it from the XMB

Step 4: ISO Loading

With PRO CFW active, create a folder called ISO/ in the root of your Memory Stick and place your legally ripped UMD images (.iso or .cso) inside. They will appear in the XMB under Game > Memory Stick automatically.[5]

CSO (compressed ISO) files can save significant space with minimal quality loss. Use CisoPlus or PSP ISO Compressor to compress your images — most games achieve 30–50% size reduction.

Step 5: Essential Plugins

PSP plugins are .prx files that run in the background and add features system-wide or per-game. Place them in seplugins/ on your Memory Stick and register them in game.txt, pops.txt, or vsh.txt as appropriate.[6]

Plugin	Function	Config File
cwCheat.prx	In-game cheats, codes, and speed hacks	game.txt
CXMB.prx	Custom XMB themes and CTF theme loading	vsh.txt
NoDRM.prx	Removes DRM checks from downloaded content	game.txt
prxshot.prx	Screenshot capture with a button combo	game.txt + vsh.txt
GameCategories.prx	Organises XMB game list into folders by genre	vsh.txt

PPSSPP: The PC Alternative

If you don't have a physical PSP, PPSSPP is an excellent open-source PSP emulator for PC, Android, and iOS. It runs virtually the entire PSP library at full speed, with upscaling to 4K, texture filtering, and save state support.[7] Many players use PPSSPP alongside a real PSP with CFW, syncing saves between the two via cloud storage.