Protecting eFuses and JTAG From Updates (R6T3, U6T1, U6T2 Methods)

27/02/14 Protecting eFuses and JTAG From Updates (R6T3, U6T1, U6T2 Methods)

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Forum Xecuter RGH & JTAG Product Support Xbox 360 JTAG Support

Protecting eFuses and JTAG From Updates (R6T3, U6T1, U6T2 Methods)

[JTAG] Jtag Falcon to RGH 2 upgrade Efuses ???By TANGO03C in forum RGH / JTAG 4 Noobs

Replies: 11Last Post: 21st February 13, 01:22

Protecting eFuses and JTAG/RGH From Updates (R6T3, U6T1, U6T2 Methods)By Ubergeek in forum Xecuter CoolRunner Installation Guides

Replies: 43Last Post: 5th January 12, 07:31

Protecting eFuses on slimBy maxxxxel in forum The Noob Room

Replies: 2Last Post: 6th December 11, 13:21

U6T2 BridgeBy RedFarmer in forum Xecuter NAND-X Support

Replies: 11Last Post: 8th March 11, 17:38

r6t3By loftlex in forum Xecuter NAND-X Support

Replies: 6Last Post: 15th July 10, 02:45

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9th March 11

Protecting eFuses and JTAG From Updates (R6T3, U6T1, U6T2 Methods)

If you are lucky enough to have a JTAG'd Xbox 360 then it is recommended that you protectyour CPU fuses (known as 'eFuses'). If you do not do this and accidentally update with anofficial MS update via disc etc you will lose the ability for your XBOX 360 to run unsigned code -therefore no FreeBoot, XBR etc., thus rendering the JTAG hack useless.

The process is quite simple and involves either removing a resistor or bridging a small gap. Youcan choose either method, it's really which ever you feel the most comfortable with. I personallybridge the gap as its easily reversible, but that just me.

First you need to remove the Xbox 360 motherboard from the case. On a side note if you aregoing to do this, you may as well fit an XClamp fix kit. There are many methods of doing this,however my personal favorite is the Xecuter RROD Repair Kit Pro II.

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1. Removing the R6T3 Resistor

Source: http://www.free60.org/R6T3

R6T3 is the label of a resistor on the underside of the 360 motherboard. of the Xbox 360. Itsupplies the necessary voltage for the CPU to burn the so-called e-fuses. Burned e-fusesprevent older firmwares (currently any older rev. than 4552) from running on your Xbox 360,thus eliminating the possibility to downgrade to an earlier version of the kernel. It is a 10k Ohm(10,000 Ohm) SMT resistor (Case 0402) functioning as part of a current limiting circuit.

Important Note:

The removal of R6T3 will cause an E80 system error if the NXE (2.0.12611.0 andabove) update is installed.Replacing the resistor with the original or with another 10K Ohm resistor usually fixesthe error state.Given the difficulty in surface mounting a resistor as small as R6T3, simply holding a10K Ohm in place while the 360 is powering up after giving an E80 will typically allownormal operation from then on.Care must be taken not to bridge the R6T3 gap without a resistor in place as thismay cause system damage.

XBReboot has virtual e-fuses, and will boot fine with the R6T3 resistor removed.

2A. Alternative Method: If UT61 is installed (Xenon & Early Falcon).

As a safer and easier alternative to removing the R6T3 resistor you can instead bridge two



solder points on the underside of the 360 motherboard. This will prevent any accidental updatesblowing eFuses. It can also be reversed very easily should you ever want to revert to an originalMicrosoft dashboard. I've used this method on several boxes so far and find it much quickerthan removing the resistor. Credit goes to Blackaddr over on xboxhacker for this alternativemethod (original thread HERE).

2B. Alternative Method: If UT62 is installed (Late Falcon, Zephyr, Opus & Jasper)

Note: There have been some reports that soldering the bridge causes E79 on Zephyrmotherboards so we would recommend removing R6T3.

Xenon and Falcon boards differ from late model Falcon, Zephyr, Opus & Jasper motherboards.You will find on late model Falcon and Jasper that U6T1 is not installed and UT62 is actuallyinstalled. The bridging process is the same and the diagram shows the difference clearly. Thanksagain to Blackaddr.

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9th March 11

Re: Protecting eFuses and JTAG From Updates (R6T3, U6T1, U6T2 Methods)

Nice high resolution shots

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24th March 11


thanks for posting this....I've added this to my personal guide!

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6th April 11


Many thanks for this very useful tutorial. I had problem with E80 after remove R6T3 in my FALCON last year but after soldered it back E80was gone. I will try alternative method from this tutorial with my old XENON.Thanks again !!!

Last edited by relax2010; 11th April 11 at 09:23.

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30th April 11


Is there a way to ensure that you've properly soldered the bridge??Meaning a test of some sort?

Last edited by Fisticuffs; 30th April 11 at 06:20.

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30th April 11


Well if you bridge two points they will be one you can see this by the eye. but if it makes youfeel better use a Multimeter set it to sound and touch both points which will be one point bynow with the probes and you will hear a beep.

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Originally Posted by Fisticuffs

Is there a way to ensure that you've properly soldered the bridge??Meaning a test of some sort?

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30th April 11


thanks J2g, I just wanted to be sure

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12th May 11


Just to clarify, if I have a xenon Jtag made with coolshrimps tool, and I have updated via jtagtool to K:2.0.1.12525.0. Does this mean that my freeboot nand also contains virtual fuses andwont go E80 ?

Regards

Ump..

Edit :- Yes I did the shorting two points method and my xbox boots fine.

Last edited by umpa2011; 12th May 11 at 10:59.

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12th May 11


I bridge U6T1 or U6T2 on every Xbox I JTAG, works great! Thanks for the guide!

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2nd September 11


cheers uber will be doing this when i jtag my falcon this weekend.

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3rd March 12


Is this needed for RGH?

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3rd March 12


No don't do it on an RGH. No point since RGHs need the LDV to update if you are doing dualnand.

This only protects you from bricking a jtag, if you update your RGH, you can still just make anew image since it won't mess anything up

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Originally Posted by digiman

Is this needed for RGH?



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9th March 12


OK thanks for the info on that

Last edited by digiman; 9th March 12 at 22:23.

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Protecting eFuses and JTAG From Updates (R6T3, U6T1, U6T2 Methods)