!!!! Is that what produces that error message? using the .org IDE? We have people asking about that error message every day, and I never know what to tell them!
if i change my arduino you think the problem is alway present ?
do you think the after sale service of arduino can exchange my arduino uno ?
I am not sure that this will help... But the symptoms below have a interesting origin."avrdude: verification error, first mismatch at byte 0x0000 0x0c != 0x00avrdude: verification error; content mismatch"What is frequently happening is that the upload didn't work at all (for various reasons) and the subsequent verification fails. The way AVRDUDE works is that it does all of the upload work first, and then does the verification second. The upload process doesn't appear to have any checks built-in. If every part of the upload fails, you won't know anything about it at this stage. Of course, the verification will fail. If the new upload is only slightly different than the old upload the first mismatch can be far into the flash (not at offset 0x0000).Why can upload fail? Many reasons of course. I have had good results using the 'Arduino as ISP' approach to uploading sketches. This approach does not use the bootloader at all. That's important when you can't trust the bootloader. Note that you MUST use the 'Upload Using Programmer' command from the file menu and not the normal upload button.