New kernel + swap cpu = jtagable????

[talkboxier]

I was just thinking with my tiny brain for a quick second.....

If one were to update to an unexploitable kernel, blowing the efuses, then replace that cpu with one that hasnt blown efuses, is it jtagable?
Is it only affected cpu, or other parts of the board as well?

[damox]

The burning of efuses blocks certain kernals from booting.

Swapping the CPU with one that hasn't had these blocks enforced will certainly allow you to exploit the box.

iirc there is nothing linking to the CPU to other components on the board, but only jasper chips will work on jaspers etc.

Quick edit: the console wont just boot (dash on the box will fail efuse checks), it will almost require the box to employee one of the exploited dash setups.

[talkboxier]

So if I swapped the new CPU in, could I go about doing a regular jtag on the box?

[Frappe051]

Do you have the CPU key / NAND from the exploitable Xbox already?

If so, I envision the process going as such:

1. Transplant exploitable CPU onto un-exploitable motherboard.
2. Make sure the Xbox works (you will get an error, as the image on the NAND will require the blown efuses that your newly transplanted CPU does not have.)
3. Install JTAG/SMC wiring to new motherboard.
4. Build and flash new freeboot image to NAND.
5. ? ? ? ? ?
6. PROFIT!!

If you don't have the CPU key already, you could flash XeLL after installing the JTAG wiring to the transplanted motherboard to retrieve it, but you would still need a KV and whatever else is required to build a freeboot image (not too sure how far the donor files will get you.)

Oh, and as damox said, you can only transplant CPU's if you have the same exact motherboard to transplant onto.

Please correct me if I'm wrong about any of this, as my knowledge is only from what I've read and speculated on over the past month or so.

[damox]

So if I swapped the new CPU in, could I go about doing a regular jtag on the box?

Assuming the CPU is old enough that it hasn't had the update applied and the CPU matches the board revision, then yes.

What Frappe051 said is more or less correct.

If you didn't have the CPU key already, you could always just boot XELL after you transplant to cpu.

*Replace non-exploitable CPU with exploitable one.
*Install JTAG/SMC wiring.
*Run XELL to get CPU key.
*Build and flash new freeboot image to NAND.

[leorimolo]

Considering the ridiculous amount of RROD xenons there are, this may very well be the only way we will see jtags soon... I have about 40 exploitable RROD consoles with faulty gpu's

[misterfre]

Hey i am about to do a cpu transplat too and i have a little question.

I have a box with error code 0003 that is jtagable and a working one without an error. Both are Xenon.

Can i install Xellous into the working nand without flashing the whole Nand of the 0003 box to the working one ?

That would save me alot of work!

[talkboxier]

I have the nand dump and cpu key from my first board which is fubar. I wanted to possibly buy another cheap board and swap it with the exploitable cpu. Cause the price of pre nxe board are a lil' out of my range. I'm kind of a jew.... 

[Frappe051]

As long as the board you purchase is the same type of board that the exploitable CPU came from,  you're good.

[talkboxier]

Considering the ridiculous amount of RROD xenons there are, this may very well be the only way we will see jtags soon... I have about 40 exploitable RROD consoles with faulty gpu's

would you sell any of those rrod xenons?

[l_oliveira]

I recently recycled a Falcon by replacing the CPU. And since the "new" CPU was JTAG-ABLE I just did it.

I'm glad I kept the case and chassis too because now the whole machine looks super nice with matching S/N in dash, shell and chassis.