JTAG-able Xbox 360 from repair centre?

[pwnsweet]

Hi guys,

I seldom post or make new threads usually because I can find the answer I'm looking for, but in this case I need to ask for your help. I'd like to know if there's any chance that Xbox 360's returned with the 7371 firmware from the service centre are JTAG-able. Does anyone have any information on this?

[thesonandheir]

Doubt it but you will never know unless you dump the NAND, first 1mb would do.

[Arakon]

Only if it wasn't repaired after may or so.
Although there've been some few cases with a CB of 8196, which is exploitable.

[jelle2503]

you are unable to find an answer, which lies well within reach of any random noob user that comes here?

http://forums.xbox-scene.com/index.php?showtopic=703757

Follow these steps to read your nand You have a Exploitable Box  :

    * Make sure port95nt.exe is installed, if it's not, install it (from nandpro20b folder) you might need to reboot.
    * Plug your 360, but don't power it on.
    * Plug the lpt cable or your usb spi
    * Go to the nandpro20b folder and type :
    * nandpro lpt: -r3 c1.bin or nandpro usb: -r c1.bin (from here on we will use lpt)
    * Read your nand a second time, so type: nandpro lpt: -r3 c2.bin
    * Compare your dumps by typing the following command: fc c1.bin c2.bin /b
    * If differances where found type the following command: nandpro lpt: -r3 c3.bin
    * Then compare your second and thrid dump: fc c2.bin c3.bin
    * use the 2 that match, if c2 and c3 match rename c3.bin to c1.bin

Now open up c1.bin in a hex editor (free hex editor) and you should see

QUOTE
© 2004-200X Microsoft Corporation. All rights reserved.


X = 5, 6, 7, 8 or 9 (depending on what dash you have/when your console was made).

now search in hex for "CB" (without quotes) your looking for the one at or around 8400 in hex (it has to be in caps).
copy the 4 hex digits after it and convert it from hex to dec with this Conveter
Like This

Xenon: 1921 or lower is Exploitable (exception: 8192 IS EXPLOITABLE)
Zephyr: 4558 or lower is Exploitable (exception: 4580 IS EXPLOITABLE)
Falcon: 5770 or lower is Exploitable
Jasper 16mb: 6712 or lower is Exploitable
Jasper Arcade (256/512): 6723 or lower is Exploitable