XBOX360 CPU JTAG port J8C1
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XBOX360 CPU JTAG port J8C1
If an exploitable 360 was flashed with a downgrader image, and downgraded to kernel 1888 would the xbox then open the efuse that disables the CPU JTAG port from becoming functional. I heard somewhere that the first efuse blown with the first update prevents access to this port, but will downgrading the kernel back to 1888 original allow access to this CPU JTAG port? and will USB JTAG NT Support this in the future if it was possible? i know that admin has an XBOX capable of being downgraded to kernel 1888 because i'm the donater and it is an Xenon..
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im not talking about the current JTAG exploit eFuse, i mean the CPU JTAG Port J8C1, you see every whenever the 360 is updated the XBOX 360 blows a diffrent eFuse. My question is if on an already JTAG exploitable console, you perform a Downgrade to the original kernel version would the CPU JTAG port J8C1 become usable, and how it would be beneficial, ex. reading out CPU key - Downgrading etc,
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Optional: Remove R6T3 resistor. Not for the average user, the resistor is small and difficult to handle, you may damage your XBox.ak4d7 wrote:If an exploitable 360 was flashed with a downgrader image, and downgraded to kernel 1888 would the xbox then open the efuse that disables the CPU JTAG port from becoming functional. I heard somewhere that the first efuse blown with the first update prevents access to this port, but will downgrading the kernel back to 1888 original allow access to this CPU JTAG port? and will USB JTAG NT Support this in the future if it was possible? i know that admin has an XBOX capable of being downgraded to kernel 1888 because i'm the donater and it is an Xenon..
Blowing a new fuse is not a problem, but if you plan to upgrade several time for experiments and you wish to remove it do so with care.
taken from iDowngrading_the_xbox360_v1.1.doc on xbins
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i know im probably reviving an older topic, however this would probably be the best spot to post my question. in regards to the e-fuse being blown to the jtag port (if this is whats exactly blown).. would something stop someone from using an over-the-top flash programmer to read, modify the code, then reprogram the chip ? also, what is this all about a cpu key?? thanks for any details!
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It's the first eFuse that disables this jtag port and its done at production. If a CPU {eFuses blown} is removed and replaced with a brand new from factory CPU {all eFuses}, would it activate J8C1? This port has a function, maybe it talks directly to the CPU/NAND/XSB. Probably the only people who know about it and how to access it work for MS, who use it to recover the CPU/DVD key at the Repair centers.
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