I followed all the steps and ran the windows batch file. My output was this:

Abracadabra!

C:\Users\adam\Downloads\UnoJoyWin-15May2012\UnoJoyWin\ATmega8u2Code\HexFiles>bat chisp -device at90usb82 -hardware usb -operation erase f memory flash blankcheck loadbuffer "UnoJoy.hex" program verify start reset 1024 Running batchisp 1.2.5 on Mon Oct 15 17:26:20 2012

AT90USB82 - USB - USB/DFU

Device selection....................... PASS Hardware selection..................... PASS Opening port........................... AtLibUsbDfu: 3EB 2FF7 no device present.

FAIL Could not open USB device. ISP done.

-1 The firmware was NOT loaded...

Did you install the Atmel FLIP program? - http://www.atmel.com/tools/FLIP.aspx -

Is the Arduino plugged in? Is is it in 'Arduino UNO DFU' mode? Press any key to exit..

The arduino is plugged in and in DFU mode although it shows as the ATmega16U2 not the arduino DFU mode under system devices. Any solutions?

Hi there - Did you install the Atmel Flip program? What OS are you running? Is it the 32 or 64 bit version? If it's showing up as the ATmega16U2, that's what it should show up as in DFU mode.

Ive encountered this...

Im assuming your trying this on the "UNO". If you are having problems getting the Arduino board to show as being in DFU mode then it could be that you are using an "R1" version of the "UNO". flip the board over and if you dont see "R2" or "R3" Then its a Revision 1 board and requires an extra step to place it in "DFU" mode.

Go to this site: https://www.virtuabotix.com/?p=673

half way down under the heading "For version One only" is possibly all you need to sort this issue.

I have the same problem with REV 3. What can I do ?

Plus I'm unable to go back into Arduino mode. The batch says : "Atlibusbdfu : 3 EB 2FF7" no device present FAIL couldnot open sb device. I can't use my arduino anymore for now.