Do you have any usb hdd or usb sticks in the xbox when trying to boot xell? try with everything unplugged.
If that don't work, I would write your original nand to xbox. then load that nand in jrunner, create and write ECC. boot to xell and ip scan in jrunner and use info to create new retail nand.
If that don't work, I would write your original nand to xbox. then load that nand in jrunner, create and write ECC. boot to xell and ip scan in jrunner and use info to create new retail nand.
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