Some time ago I completed a project with AVRStudio and WinAVR, using the AVR JTAG ICE MKII and a ATMEGA32.
I have a new project with an ATMEGA128, and decided to reinstall AVRStudio and WinAVR (after some odd stack configuration problems).
The first time I connected to the MKII, AVRStudio asked me if I wanted to upgrade the firmware (the MKII was connected over USB), I clicked yes. It errored out, and now the MKII shows up as an "unknown device" in device manager. It is like the USB hardware somehow got corrupted on the MKII.
I connected the MKII up by serial and it the upgraded the firmware OK, and can now be used over serial. But even after the firmware upgrade, the USB still shows "unknown device" in device manager.
Do you have any ideas what caused this trouble, or what I can do to fix it?
Thank you for your help.