Problem after JTAGICE mk II firmware upgrade

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#1
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I installed the latest AVR Studio (4.12 Build 460) and everything was going fine until I replied OK to the firmware upgrade. The first time I was asked about the upgrade I declined, and my program worked. The next time I agreed and problems arose involving serial communication. I had written interrupt driven UART code which worked fine with 4.11, and also with 4.12 until I upgraded the firmware.

No problems were reported while upgrading the firmware.

I went to another PC that still had AVR Studio 4.11 and encountered different problems during startup.
The Message box said:

Failed to set device descriptor. Unable to continue debugging"

The log said:

Coordinator Error when trying to make JTAGICE target device enter programming mode.

Coordinator Error loading object file.

I have a second JTAGICE mk II device which was not upgraded. I plugged that into the second PC and everything worked fine.

MY QUESTIONS:

During the firmware upgrade, is AVR Studio downloading the firmware from the web site or from its internal files? Could this be an Internet connection problem?

Is this new firmware supposed to be compatible with AVR Studio version 4.11?

Thanks in advance,
Michael Bate

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I made some progress.

Some but not all of my problems were caused by bad connections.

Everything is now working as long as I use AVR Studio 4.12 with the new firmware, which appears to not be compatible with 4.11. Once you upgrade firmware, you are apparantly committed to 4.12.

I had to upgrade firmware a second time to get things to work. This time, I used Tools/JTAGICE Mkii Upgrade from AVR Studio (The first time I had responded "Yes") to the query "Do you want to upgrade firmware? Both upgrades appeared to be successful (no problems reported during upgrade procedure).

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I think you could run version 4.11 and hit the upgrade jtag button to DOWNGRADE the jtag firmware to the old version.