Question about E-Fuse and dash upgrade

[_pinto]

Hello.
I've got an old JTAG-able 360 laying around. It has a version 7xxx dashboard, and should be JTAG-able according to the guides I've read.

I'd like to try JTAG-ing it, but not right now.
I have read that you should unsolder a specific E-fuse after you have JTAG-ed your xbox to prevent it from being blown when you update your dash, and thus not being able to use your JTAG.

What I'm wondering is, can I unsolder this E-fuse now, on my NOT JTAGed box, and update the dash to newest version and use the xbox as a normal xbox, then JTAG it later on in some way?

Would it work, and would I have to re-solder the E-fuse?

 

[Martin C]

Hi

The e-fuse in question is located inside the CPU itself and is microscopic.

What we advise to desolder is a resistor (R6T3) which prevents this e-fuse from blowing.

Before the NXE dashboard, you were able to remove this e-fuse and update the dashboard at will. However, Microsoft got smart and made a check to ensure the e-fuse had been modified as part of the update. If the resistor was missing (and no change had taken place), E80 error was given and the only way out was to replace the resistor and allow the e-fuse to blow.

I hope this makes sense so far.

In your situation, you can take a good NAND dump now and remove the resistor. You could then JTAG the system with the Kinect dashboard and use it as an offline console. If you decided at a later date you didn't want to use it as a JTAG any more, you could remove the JTAG wiring, replace the resistor and restore your original NAND dump. You cannot however, do it the other way round.

 

[_pinto]

Thanks for you reply. It was very clarifying