avrdude: verification error, first mismatch at byte 0x000 0x0c != 0x62

What on god's green earth does this mean?...

I'm using an Uno board. Out of the blue I receive this error message:

avrdude: verification error, first mismatch at byte 0x000

  • 0x0c != 0x62*
    avrdude: verification error; content mismatch

I've done dozens of uploads on this board. All i did was simply edit my code and change a few small things and then this error came about.

I have nothing hooked up to it but the usb cable for trying to get past this error. I've tried uploading a blank file to the Uno board and I still get this error. I've tried burning the bootloader and it tells me:

avrdude: usbdev_open(): did not find any USB device "usb"

What in the world is going on? The most recent working project I had on this board was a controller that I was using to send serial data to another arduino. I was using "EasyTranfer.h" to help transfer my data. And like I said previously, I made a few changes and then tried to reupload the code and it stopped working... even after it worked before. I even tried undoing the changes I made in the code and it still doesnt work. Did i break this thing?

I desperately need help with this. I'm still fairly new to arduino, which makes this situation even more frustrating since I have no clue what to do.

I think that means it was trying to verify that the memory had been written correctly and it either read 0x0C when it expected 0x62 or the other way around. If you turn on verbose output during uploading (in Preferences) you will get to see all the programming steps, including the data being written and what area of memory was being verified when the error occurred.

Thanks for replying, Johnwasser! Nothing against this forum, but I honestly didn't expect anyone to respond based on how quiet other forums were to this questioned this error. It seems that nobody has really been able to provide any solutions for others who have had this problem. I hope that it isn't that uncommon or that specific of an error.

I will have to try what you suggested later tonight, Johnwasser. Although I'm not sure if it will be of much help to me due to how inexperienced I am with fixing hardware/software bugs.

If the verbose output doesn't help you, you can always paste it here and maybe someone with more experience will notice something that you missed.

Hi, I'm having the same issue...

Setup:

  • Macbook
  • Arduino Uno

I've removed everything, only the USB is connected. Tried other USB-ports, USB-cables & even tried on another Macbook.
What is wrong with my Arduino?

This is the verbose output when trying to upload the Blink-sketch:
http://pastebin.com/GTz81JpE