Hello,
a new toolbox and firmware is available from here:
Cygnos360 V2 Toolbox 1.05.zipCygnos360 V2 Firmware 1.02.zipThe new toolbox and firmware address a problem, where a 3RROD error is displayed, if a JTAG hack image is used in conjunction with an original image. This currently affects Zephyr, Opus and Falcon consoles. We have tracked down the root cause of this error and determined, that the patched SMCs in the original JTAG hack images are the cause. Xenon and Jasper consoles should not be affected, but we supply a fix for them as well.
The new toolbox can now generate a patched SMC specific to your Xbox 360, that will not lead to the 3RROD error. Here's a screenshot, showing the new dialog:

Just select your original image in the "Image" box and pick an output file for the patched SMC in the "SMC" box. Once you press the "Patch" button, the SMC will be extracted from your original image, its hash checked, the patches will be applied to it and finally it will be saved.
The toolbox can currently patch Xenon, Falcon and Jasper SMCs. We will add patches for Zephyr next week. If you have either a Xenon, Falcon or Jasper SMC that the toolbox does not recognize, please contact us. We will work on a patch for you.
Once the patched SMC has been generated, the JTAG hack image needs to be rebuilt. The command for this is as follows.
python build.py dump.bin <console>_hack.bin smc.bin xell-1f.bin xboxupd.bin
Replace <console> with your console type. "dump.bin" is an unmodified dump of your console.
Once you have successfully generated and flashed the new JTAG hack image, please update your firmware as well. Otherwise, the JTAG hack won't work anymore. This update should not be applied, if the JTAG hack is not performed by Cygnos360 V2, but by the SMC instead. A fix for the 3RROD error will not be provided by us in this case.
With this update, users should never experience a 3RROD error again, when switching between a JTAG hack image and an original image. Additionally, injecting the JTAG hack should now work with 100% success. Disconnecting the power-plug for a brief moment, before switching between a JTAG hack image and an original image is now no longer necessary as well.
The moment, the JTAG hack is injected is now indicated by the LED inverting its state for a short period.
Your feedback is welcome!
Cheers,
TRaceBack