avrdude: verification error, first mismatch at byte 0x1d3f, on the next line: 0xc0 ! = 0x02. And the final line has: avrdude: verification error: content mismatch.I am a novice with the coding and would appreciate any help offered.
I have seen cases where people have 3 exclamation points in a row in their code, and it causes uploading problems. Do you have !!! somewhere in your sketch?Are you able to upload other sketches to your Mega board?
checksum error timeout errorverification error