Jasper (v4) 7363 Large Block Jasper-Kernel (512M) (These MAY work but you need to dump and check the CB version to be sure) (After June 17th 2009 Manufacture date probably will NOT work - but check anyway)
Jasper (v4) 7371 Large Block Jasper-Kernel (512M) (These MAY work but you need to dump and check the CB version to be sure) (After June 17th 2009 Manufacture date probably will NOT work - but check anyway)
JTAG Not Working
These (2BL)CB versions are patched so the JTAG Hack is no longer working: (4BL)CD = 8453 for all of them:
Xenon: 1922, 1923, 1940, 7373
Zephyr: 4571, 4572, 4578, 4579, 4580
Falcon/Opus: 5771
Jasper: 6750
The first thing you need to check, is your xbox kernel. At the time of writing, the most recent kernel is : 2.0.12625.0 (Released 19th January 2011)
Turn on your xbox and go to console settings.
Go to system info, the kernel version is on top right.
As of 5/12/09 (December 5th 2009) If you have kernel 2.0.8495.0 or HIGHER, YOU CANNOT INSTALL Xell / Freeboot / XBReboot and therefore CANNOT JTAG your Xbox. Ignoring this and asking anyway will NEVER change that fact.
Having the NXE Dashboard is not the indicator and just because your dash is in the 7XXX series does not mean you can not exploit it. The only fact is that any the 8XXX latest versions CANNOT be done. There is a slim chance the 7363 or 7371 can still be exploited. There is no "Downgrading".
For easy motherboard identification see attached image of external PSU socket and also math with HDMI info below:
Xenon (Non-HDMI)
Zephyr: (HDMI)
Opus: (Non-HDMI)
Falcon: (HDMI)
Jasper: (HDMI)
Here is an easy to follow chart on what can and can't be JTAG'd
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Ubergeek on 2011-03-23
