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I just bought a new Arduino Leonardo Eth, and, it was working perfectly.

I probably uploaded about 30 different sketches, and it did everything as expected.

The basic sketch was using the fade demo on pin 9 to ground with a LED attached.

I was then curious on how long the unit takes to restart, so, I unplugged the USB and put it back in.

When it started back up, the LED was on solid. I then restarted it again, and I honestly can't remember the state of it.

When I plug it in, it gets detected in the Arduino application and I see the port, but, after about 20 seconds, I get a popup on Windows saying about a malfunctioning USB device.

Pressing reset on the Arduino or unplugging/plugging it back does the same - I get about 20 seconds, and then it "goes bad".

Even if I am real quick in the IDE, or press restart after compiling/before upload, it just hangs.

I'm really annoyed with myself if I did break it, but, I'm not really sure what else I could have done differently... after all, there isn't an off switch.

Does anyone know what I have done, and, is there anyway to fix it?

William Hilsum
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You should be able to use my board detector sketch on one of your other Arduinos to check out the problem board.

See also Have I bricked my Arduino Uno? Problems with uploading to board

Also my bootloader uploader sketch will reflash bootloaders on quite a few devices. I'm assuming that the "Arduino Leonardo Eth" has the same bootloader as the Leonardo.

Hmmm - I see that the "Arduino Leonardo Eth" is from Arduino.org, not Arduino.cc. The bootloader is probably slightly different. I'm really not an expert on what those boards use.

Before worrying too much, try the approach of holding down Reset and then uploading a sketch, letting go of Reset as the sketch starts to actually upload.

Comment by William Hilsum

I didn't realise there was a difference between .org and .cc, and, I guess by using the leonardo template from .cc, I broke "something". The moment I downloaded the IDE from .org, & uploaded with the eth template , it worked flawlessly. I guess there are some changes between leonardo and leonardo eth. I wanted an arduino with ethernet, so I didn't need a separate shield. No idea if I picked the right "side" after reading all the crap with cc vs org!

That is very annoying that the split of the Arduino camps now produces a support nightmare for people who just want to use their virtually identical products, but have to go through this.

Thanks for the update.

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Nick Gammon
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