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If you're looking how to play your favourite PS2 games with your PS3 DEX, and add in case Codebreaker codes in it, you're in the right place. It's very easy, so let's start

N.B : I'm using Rebug 4.70 DEX for this tutorial.

CONTENT YOU NEED!​

- A PS3 on DEX Firmware ( CEX firmwares support PS2 aswell, but here we are going to use the method for DEX )
- WinRAR
- ImgBurn or any ISO writer
- Your PS2 ISO game
- Codebreaker pack files You must login or register to view this content.

Ok, because we are on DEX, ps2 classics method won't work. It only works for CEX. But, Rebug has Cobra Mode, means we can play ISO games.
So, let's boot Rebug Toolbox first, and let's go here :

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Put Toggle COBRA Mode : Enabled
Toggle PS2 Emulator : COBRA
Toggle webMAN : Enabled

First, we need to create a PS2 Memory Card. You can do it from XMB, on " Utility save data PS2 ". After created, you have to assign it to " Slot 1 ".

After this, we have to restart ps3, so just reboot it.
Let's move on PC. We need the ISO of our game so :
a) If you have a disc game, we can extract the ISO from it. If you follow this, go to a2.
b) Just search the ISO of your game in internet and download it.

a2) Ok, we need to extract the ISO from our disc. Just open ImgBurn, and click " Create image file from Disc "

Put your disc, then select the Source where your disc is placed. You can also edit the destination of the ISO. After that's let's boot it by clicking on the disc icon.
Then wait till it finishes. Now we should have the ISO placed in the destination we have chosen.

Now, if you want simply play your game, place the ISO in " dev_hdd0/PS2ISO " on your PS3 with a File Manager, or Filezilla. Then you can mount your game from mmCM or webMAN, and play it.
If you get a no-signal in your TV, check the settings on Rebug Toolbox, and make sure that PS2 Emulator is set to COBRA.
If you still have no-signal, you might have to change the resolution. in XMB, go on " Settings ", then " Display settings " and change your video resolution from 1080i/1080p to 720p. Then try again.

HOW TO ADD CODEBREAKER FILES IN OUR GAME​

With Codebreaker, you can " mod " the game. You will be able to use various codes for your game.
Let's right click in our ISO, and choose " Extract to (namefile) " and wait till it finishes.
Now enter on the main directory of the game : here we have to place three files, that you can get from the Codebreaker pack. The files are :

BOOT.ELF
CODEBREAKER V10.ELF
SYSTEM.CNF

For SYSTEM.CNF, you will be asked if you wanna replace the file, select yes. Now, rename the " CODEBREAKER V10.ELF " to simply " CODEBREAKER.ELF ".
Now we have to make our custom ISO. Open ImgBurn, and select " Create image file from files/folders "

Now, click on " Browse for a folder... " . It's an icon of a folder. Then select the main folder of your game ( the folder where ALL FILES are placed ).
Select the destination, click on build.

Now you should get this message :

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Click YES.
Then you should get another window, where you will be asked to put a name for the volume label. Put no names in ISO9660 and UDF, so like this :

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Click YES, then OK. Just wait.

When it finished, you always have to put the ISO in dev_hdd0/PS2ISO, mount it and boot it.

The game now will not boot as normally, it will bring you in a grey window instead. In upper right you should see
" LaunchELF v4.42b ".
Your controller will turn off. Plug it with a cable and turn it back on. Then press CIRCLE for enter FileBrowser.
Move to cdfs :/ and press CIRCLE. Move to CODEBREA.ELF and press CIRCLE.
Codebreaker program now will load. After it loaded, go on " Select Cheats " and press X. Look for your game, when you are on it, press D-PAD right and enable the codes you want. Then press start. You will be again in the main menu, now press Start Game. It will ask you to insert the disc, press OK and LaunchELF will load again.
Go again in cdfs :/ and press CIRCLE in " SLUS_XXX.XX ".
Your game should boot and you will have the codes enabled!!

N.B = Maybe some games will not work with CODEBREAKER files added on it. It will give you " no signal " as a result.

If requested, I'll make a video tutorial. Enjoy!

Rogero isn't Cobra so normal ISO way won't work. You have to convert your ISO into an encrypted PS2 ISO Classics image, you can do this using a tool made by ps3aldostools or directly from multiMAN. If you click circle on the ISO on File Manager Mode, you should see the option for convert it.
Also, you can get the ISO from the disc of your game ( if you have it ) or download it from internet

Does the controller even sync wireless? Because on Habib 4.70 it was supposingly fixed but would always make me connect the controller xD.

Nope. The same thing happens to me

so if i want to change my cfw from rogero what cfw you advice me to change to it ? so the ps2 games can work on it ?

Well, depends since Rogero is a CEX Custom Firmware..
Honestly, I started with Rogero aswell, first 4.46, then 4.50, and then 4.55. Then I switched to Rebug DEX, and now I'm on Rebug DEX 4.70, and I like it moooore than Rogero. But, because it's DEX, I had to do the conversion.
If you wanna go to another CFW, but you wanna be still on CEX, Habib 4.70 or Ferrox 4.70 should be good CFWs. They are both CEX. If you wanna go on DEX, I can say that Rebug is perfect.
PS2 games works even with Rogero, but I suggest you to upgrade to a 4.70 CFW ( as I said before, Habib or Ferrox ), because they are always CEX, and they have COBRA support, unlike Rogero.

I'm just getting a black screen when I try loading with or without codes. Why?

Make sure you rebuilded the ISO in the correct way, so that the structure is fine

Followed this word for word.

Hmmm.. what game you tried?
Also, if you can, try a different game