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Topic: Arduino UNO R2 8u2 Reprograming (Read 21191 times) previous topic - next topic


Thanks for the reply.
I have now viwed the page using another browser and the highlights are showing, unlike before.
I have to say that Windows7 with IE8 doesn't like the reply box, and keeps scrolling to hide your typing....



My pleasure! Glad you found a browser that works (here), too!


Jun 18, 2011, 11:20 am Last Edit: Jun 18, 2011, 11:22 am by sammix02 Reason: 1
Hi there

Trust me to find the easier solution a day after I found the workaround  XD

I know this is late and you probably completed a few projects since this post but as a matter of interest, I used this process on my R2 and it worked:

Copied from http://forums.adafruit.com/viewtopic.php?f=25&t=19751

In order to use FLIP, you must put the Arduino into DFU mode and to do that you must bring the HWB pin of the '8u2 low. You can do that with the points shown in the picture. It is still the same as the PTH Uno, the left side of the capacitor that is directly above the RESET_EN bridge. The steps exactly are as follows.

1. Hold the reset pin of the '8u2 to ground to hold it in reset.
2. While doing that, touch the other wire that is connected to ground to the HWB pin (shown in diagram).
3. After touching HWB to ground and releasing, release reset. The device should show up in Device Manager as Arduino Uno DFU or something like that. The driver will not be installed, install it from this location on your hard drive if FLIP is installed. C:\Program Files\Atmel\Flip 3.4.2\usb. It will remain in DFU until power is removed or it is reset from FLIP. It should then come up as AT90USB82 in device manager. Select that in FLIP, you won't find ATMega8u2.

That is how you connect for FLIP.


  • On the R2 you have two caps between the RESET-EN and the RX LED. Use the one closest to RESET-EN.

  • The R2 has pins where 'wire1' must go.

It is a much longer route than just shorting out the two pins but I always like to know that there are alternatives available.

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