Question Pertaining to E-fuses

[xColorado880]

Okay so I would like to update my Jtag and to the 12625 dash because my retail xbox broke.

I am going to remove the wiring and what not and flash my original NAND back.

Than I was gonna update to the latest dashboard using a USB.

I know this will blow my e-fuses but in the case I would like to use it later as a Jtag, can I just manually flash back my freeBOOT image and it will still be a Jtag?

If i'm not mistaken, the blown e-fuses just take away the ability to get your CPU key and since I already have that i'm safe to update. Please correct me if I am wrong. I appreciate any help you can give.

Thanks

EDIT: I think this just answered my question. I probably should of looked harder before posting. Any other info would still be helpful though

it is impossible to have a console that is a JTAG and retail simply by switching nands there are system protections in place to prevent that (fuses)

fuses are burned when updating the console, stopping the vulnerable kernel being loaded once they are burned. think of it as blacklisting a certain kernal version and below.

you would have to physically update the console to get the latest dash, it would be impossible to build one using your pre 7371 dump AFAIK so goodbye JTAG.

also i'm sure theres a fuse check as part of the dash launch, and the console would either fail to boot (with LDV mismatch or similar) or even worse blow the fuses rendering your JTAG unexploitable.

Once the fuses are blown it doesnt matter about having the cpu key, the console simply will not boot the vulnerable kernel again and the console can no longer be JTAGGED.

believe me if this setup was possible i'm sure the actual homebrew/hacking experts would have released the info by now.

just do like the rest ofus, have a JTAG console for homebrew, and a retail console for live.

[routehero]

efuses are one way, as in, you can not go back.

If you want to keep your jtag, go buy a 360S.  They're < $200 in North America.

[l_oliveira]

Keep the JTAG as it is since you CAN'T replace it.

Buy an standard (non hackable) system and replace your failed unit with it.

Doing anything different than that is a waste.

[Gazcoigne]

If i'm not mistaken, the blown e-fuses just take away the ability to get your CPU key and since I already have that i'm safe to update. Please correct me if I am wrong. I appreciate any help you can give.

you are mistaken, the fuses stop the exploited kernal from booting, which in turn allows you to run unsigned code and XELL, and get your CPU key.

CPU key is not a magical code that unlocks homebrew, its just a number used to encrypt your NAND image.

once you update, the burnt fuses stop the exploited kernal running, so your CPU key is then useless after the fuses are blown.

too many kiddies thinking that the CPU key is the key to the world coz all they can think about is how to get unbanned to play more hacked lobbies of COD. pisses me right off.

[jelle2503]

I guess people still don't know if you update past 7xxx there is no exploit anymore lol

[Gazcoigne]

too many $#!t sites like *** popping up, leechin only parts of the hack to spoon feed to the nublets who cant take the time like the rest of us to learn the whole picture.

[l_oliveira]

too many $#!t sites like *** popping up, leechin only parts of the hack to spoon feed to the nublets who cant take the time like the rest of us to learn the whole picture.

Instead of saying that, let the fool restore the flash, update the system and think he will be able to get the thing back into a JTAG system. 

To the OP:

Updating with the normal MS updater will transform your JTAG unit into an non vulnerable XBOX360 unit that you just happen to know the CPU key.
Keyvaults on anything but Xenon consoles are hashed with the CPUKEY which means they only work with the CPU they're married to. Mismatch or corruption causes the console to "Christmas lights". Basically you can't unban consoles anymore.

Trying to return to the old state will result on 3RLOD. <- this is why undoing an JTAG is a waste.

You have been warned.