Hello and welcome to YoYo's guide on soft modding your fat ps2, here you will learn how to soft mod your ps2 to play back ups without a modchip, play emulators, play homebrew, watch .AVI off of a HDD, load back ups off a internal and even external HDD, and much more.
This guide is designed to help you get the most out of your PS2 without spending money!

Things you will need (For just expoilting your ps2) .
1. A fat PS2
2. A PSX/PS1 trigger disk (This will boot the expoilt)
3. Action Replay MAX or Codebreaker (They must supports USB drives)
4. A USB flash drive (AKA: You could even use your PSP :) )
5. The required programs.
You must delete your Your System Configuration to expoilt your PS2!

Ok, wee are first going to start by having you download the required programs, I have taken the time to add everything you will need into one rar, Download it HERE!
Make a new folder on your desktop named 'PS2 Mods' and extract the rar you downloaded from above to the folder you just made.
Now that you have the files your going to need, it is time to find a PSx/PS1 trigger disk. When you load a PSX/PS1 game in a fat PS2, the ps2 looks for the file on your memory card called 'BOOT.ELF' Having that file modified the ps2 will boot uLaunchELF, a PS2 homebrew app. that is used to launch .ELF files on a PS2. Finding a PSX/PS! game that works as a trigger disk can sometimes be hard, I once seen a list online but can not seem to find it anymore, once I find it I will be sure to add it. I use Silent Hill 1 for PS1 as my trigger disk, I also know that THPS 3, Cool boraders1 and 2 work. Now that you have your PSX/PS1 and put it in your disk drive and wait for it to load. Once your computer has loaded the disk go to your PS2 Mods folder, go to PS2 Softmods folder and run the program IDGET.exe.
The program will start and press the button 'Get' and it will tell you the ID of your PS1/PSX game, WRITE THIS DOWN!!!!!!!
Next run the program Titleman Frontend, Click ‘Create TITLE.DB’ and next enter the ID of your PSX/PS1 game your using, click ‘Add Exec’. Click ‘List current contents of TITLE.DB’ and confirm your entry. Pay special attention to the initial four letters, sometimes TMFE messes these up. The TITLE.DB you just made is in the Titleman Frontend folder.
Now open the program PS2 Save Builder.
Note* If your some what lost on what wee are trying to do. The goal is to get the files TITLE.DB and BOOT.ELF on to your memory card, so when you try and load your trigger disk, instead it will load uLaunchELF.
OK, on PS2 Save Builder at the top go to File create a new save. Ok now under ‘Root/ID’ put ‘BADATA-SYSTEM’ for US/NTSC
or put ‘BEDATA-SYSTEM’ for EUR/PAL. Ok now wee need the TITLE.DB you made, it is in the Titleman Frontend folder, drag and drop the TITLE.DB onto thw white box on PS2 save builder. Next drag and drop the 'BOOT.ELF' onto PS2 save builder.
Also, drag and drop any of the other .ELF's you would like on your memory card.
If I were you, I would only add Cogswap.ELF and HDL.ELF on your memory card, having to many .ELF's on just your memory card can take up ALOT of space on your card. I would recommend using a USB flash drive/external HDD to keep your .ELF files. But as I said you at least want Cogswap.ELF on your memory card. Cogswap loader is a program used to boot back up games on your PS2, it is handy to have it on your memory stick ;) And now that I think of it, I didnt add Cogswap.ELF to 'PS2 Softmods' rar.. You can download CogSwapLoaderHERE
Ok so now on the PS2 save builder you should have these files
BOOT.ELF
TITLE.DB
COGSWAP.ELF
icon.sys
my.icn
Now at the top go to file and save as, name the expoilt and right below the file name you will see the drop down box were you can change the file format, if you are using AR Max you must save the file in .max to the root level of you USB Flash drive/PSP.
If you are using codebreaker you must save the file in .cbs to the root level of you USB Flash drive/PSP.
Ok plug your USB flash drive/PSP intothe USB ports of your PS2 and start AR MAX, when AR MAX loads go to Max memory. When it loads press X on My device's. Choose memory card 1. Find and select ‘Your System Configuration’, then choose delete to delete it. Wee do this because our exploit files are going into the same folder as the system configuration (BADATA-SYSTEM) and certain versions of ARMAX will display an error (File already exists) if you don’t do this first. All the system configuration file contains is a couple settings (screen size, language, etc), so don’t worry about deleting it. These will be reset to default after doing this.
Ok now press triangle to go back then go over to your UBS drive, press X it will load and you will see ‘NEW_FILE’ (this is our exploit.max) and go down to ‘Uncrush to MC1'. Confirm and wait a couple seconds for it to extract.
:)
Alrighty! Once it has finished shut off your PS2, reboot your PS2 and put in your PSX/PS1 trigger disk and the memory card with your newly added expoilt. Start the game and if it worked the screen should blink once and then load to this screen but with a white background ;)
You have just soft modded your Playstaion 2 :great:
Ok from you press O and it will take you to the file browser, from here you can search all device's on your PS2, your HDD, your memory card, launch .ELF's fromUSB drive/PSP or external HDD and run .ELF files (AKA: Hombrew :) )
The .ELF's files the I gave you in the download are
HDL_0.8b.elf = HD Loader, Play Ps2 game from your internal HDD
CogSwap.elf = Loads burnt PS2 back ups. A tutorial on how to use cogswap can be found below
SNES_EMU.ELF = Super nintendo emulator :) Roms not included
USBA_WAR.ELF = USBAdvaned, Play back up PS2 games off of a USB drive :)
SMS Verison 2.5 (Rev.3).elf = A very nice media played that plays MP3's, .AVI, .MP4 has bugs though. I this program.
Note* This guide is Not done, I plan on adding much much more.. please come back soon :)
NOTE- A new and better method of booting back ups is now out on PS2, I will make a new guide soon.

<Myth0s> i love boys
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psp=hacked
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Great guide, Yoyo! Now can you do one for Slim PS2's? :D :D

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Like what, pushing elevator buttons?

O_O what a awesome guide :great:
I'm going to do this on my cousins ps2
muhahahahahahhahahahaha :evil:
thanks yoyo

haha nicce
i wish i kept my action replay max.. o well ill buy a new one next time i go 2 best buy.