Step 1:
Extract it and you should get a PSP folder and UMDGENv4.00.exe
Copy the PSP folder in the root of your memory stick if it prompts you to overwrite just click Yes to all (for xp) or yes (for windows vista and windows 7).
Step 2:
Open UMDGEN. You should see a window like this:
Click open on the upper left of the UMDGEN window and locate to your iso. Then click Open.
I’ll be using my Dirt 2 backup for this tutorial.
Step 4:
Then click Extract Image:
When you were prompted where to save just locate to the folder you want to save your extracted image.
Just wait for the extraction to reach 100%
Step 5:
Now locate to the folder where you’ve saved your extracted image then open the folder PSP_GAME>>SYSDIR you should see like this:
Step 6:
Connect your psp to your PC.
Then copy the EBOOT.BIN to the root of your memory stick.
Then disconnect your psp
Step 7:
Now run the Gamedecrypter that you’ve copied on step 1. You can find it on games. Just like this one:

After it was loaded. You should see a black screen with some text. Just read those texts and press X to patch your EBOOT.BIN
Step 8:
Connect your psp again to your PC
Then you should see a new folder on the root called DECRYPTOR. Open that folder and copy the EBOOT.BIN to the location of your extracted images (PSP_GAME>>SYSDIR).
If it prompts you to overwrite just click yes/yes to all (for xp) or Copy and Replace (for vista and win 7).
Step 9:
After copying the EBOOT.BIN open UMDGEN again. And drag and drop the PSP_GAME folder and UMD_DATA.BIN.
This should come up:
Then click save. It’s up to you what file type you want to save ISO for uncompressed. Or choose .cso/.dax for compressed file.
I’ll choose .cso this time.
Click continue to this one:
Then wait for the packaging to finish.
Step 10:
Connect your psp to your pc through USB cable again. Then copy your new file to your ISO folder
Now let’s take a look at Dirt 2:
I’ve also tried it on Naruto shippuden here’s my screenshot:
That’s it! Congratulations you can now play 5.55 Games to your psp with 5.50Gen-B2.
For more information just visit: www.pspgen.com
Credits:
Big Thanks to yoshihiro – for this game decrypter
GEN team – for the cfw
Shaqdarcy – for the tutorial
*Note: In order to play these games your "UMD ISO MODE" must be set to M33 driver
just added gamedecrypter v2 now it works with marvel ultimate alliance 2
If you’re having difficulties you can just leave a comment here and I’ll reply to you as soon as possible.
Remember saying thank you isn’t that hard if the person deserves.