The first thing you need to do is download ABGX 1.0 for your current platform - Download them here. This is also the latest version, which supports iXtreme Firmware 1.51 with Wave3 support.
Now, install it and let's get started.
Next you need to have your Xbox 360 Backup ripped to your pc HDD using a Kreon drive, your 360 drive depending on FW type or a pc drive using the wxripper method.
This is how it should look on a PC when you first open the program. What we're going to do next, is create two settings for use. One of them will be just to verify a ISO image, and the next, is only to be used, if the game does not come back Stealth Verified.
The first thing you need to do, is click on the AutoFix tab, and select Level 3 (Autofix is stealth passes but fails verification).Once you have done that, go to the top left of the program, click on File -> Save Settings. Name is anything you want, I named it "FixingISO".
So now we have two settings, a Default, which should be used on all backups you get, and a Second one, to patch them if you run into issues.
Now were going to load a iso image. And if you're wondering, if the .dvd file is incorrect, both settings will automatically create a new one, that you can use IMG burn with.
Go ahead and click on the folder, to select your iso image.Okay, the next step once you have loaded the file, is to click on the Launch button on the bottom of the program. Let this cycle through all the way. If for some reason you get an error, this is when you want to load the custom settings you created earlier. So for this first pass, let's just keep it on the default settings.

You should see a screen similar to this. Let it run all the way through. Typically, if the stealth passes, once it gets to checking the Game CRC, i just hit Q to quit the process. But in your case, let it go all the way through.

As you can see from the image above, this Backup failed verification, there was no verified rip of the Xex/SS in the online database. This is when you'll click on load settings, or just click on Autofix level 3. Then, just re-run the program, and it will automatically download and update your Backup ISO. Other types of failures are you might get are error's in the SS, DMI, or PFI, thus it will automatically quit.
And that's pretty much it. The only step you have to do next is burn it with IMG Burn, which can be found here. Also, make sure you're using good quality media, such as Verbatims 2.4x DL, those are the only Dual Layer Disc that I recommend for burning Xbox 360 backups.
Enjoy!

