Arduino UNO fails to upload (first mismatch at byte 0x0000)

Development Tools IDE 1.x
1

Hi, I got my arduino only a week ago and it has been working fine.

My computer had some issues so I had to do a major restore system. Upon connecting the arduino the computer didn't recognize it and when I tried to install the drivers it failed. I tried again and it worked, so I proceeded to do the blink test. However, when I uploaded the sketch, I got the following error:

avrdude: verification error, first mismatch at byte 0x0000
0x0c != 0xff
avrdude: verification error; content mismatch

what could be the problem? It had been working just fine the night before. I tried resetting right before uploading, and tried it on another computer and it gives me the same error.

Thanks for the help

2

That sounds like data rate mismatch between PC and bootloader.
Do you have the right board type selected?
Sometimes you're better off after big changes like you did to re-boot to a known configuration and go from there.
I aggravated myself for hours once when I re-bootloaded my Duemilanove, only to have unknowingly put the Uno bootloader, and then have every serial upload fail - I had Duemilanove selected for the board , so PC was using 57600, while the board thought it was an Uno and looking for 115,200.

Seems like one or the other could be made a little smarter to determine a matching baud rate.

3

Thank you for your answer.

From what I understand (sorry I'm very new to microcontrollers) I have to reboot to a known configuration, are you talking about baud rate? How do I do that? Is there a setting I should change? Tomorrow a friend is going to let me borrow his arduino to test it on my computer. I'd like to say that I tried it also on my other laptop and had the same error, blinking sketch wouldn't load giving me the same message.

And yes I made sure I selected the correct board (UNO) and the correct (and only) port.

Thanks again for your help

4

If you have a 2nd arduino that you can load sketches into, then you load one with a program that can download a bootloader into a 2nd arduino.

Just need to come up with 6 connections between the 2 boards.

5

So will that basically wipe out the "damaged" arduino and restore it to brand new settings? from what i understand that's what it does right?

Thanks a lot for your help.

6

Yes. Altho not so much "damaged" as just not in sync anymore.