If you don't already have a copy of your nand, you can use a variety of methods to get it from your console:

a)If on a phat or slim trinity you can use "Nand Flasher 360 v1.2"
b)If on a Corona you can use "Simple 360 Nand Flasher w/4gb support"
c)On any console that can boot Xell if you boot it with a network connection, and then type in that IP address into a web browser on the same local network you can actually pull a copy of your nand that way (may not work for Corona 4gb)


Method A from above (for all phats and Slim Trinity):

For Phats and Slim Trinities using "Nand Flasher 360 v1.2" is pretty easy. You can google and find a download of it easily. Load it onto a USB and hen it's as simple as using FSD file manager or XexMenu to browse to the default.xex and launching it.

You'll get a window like this:
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It's straight forward - just click the "dump nandflash" button on the right side and wait. Don't press any buttons on the controller while this is happening. Then just power off the console and you'll find a "flashdmp.bin" or "nanddump.bin" in the nand flasher 360 folder on your USB.

Method B from above (for Corona and Corona 4gb nands):

It should be easy enough again to google and find a download of "simple nand flasher with 4gb support". Once again place the folder with the default.xex of the program on a USB. Using FSD or XexMenu browse to and launch the default.xex and on screen it should prompt you with several options like below:

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Press X to dump your nand, wait for it to finish, then power off. If you put the USB back in your computer you'll find a flashdmp.bin or nanddump.bin in the folder along with simple nand flasher.

Method C from above (should work on all consoles):

Dumping your nand over the network is slow - you should only do this if for some reason none of the other methods work for you. For this to work you need to boot up Xell with a network cable plugged in (wifi will NOT work). When Xell is fully booted it will display an IP address towards the bottom that will be 192.168.X.X (the X's will be unique to your network).

Simply take that IP address and type it into a web browser on a computer attached to the same network. You should get a page that looks like this:

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Simply click the button to download your "raw flash" and name the file nanddump.bin and save it. This will take quite a while, and you have to leave your Xbox on and running Xell the whole time.