Hello everyone,
I've been using the Arduino Uno R3 SMD Edition for about two months but, just now, I've encountered this issue:
avrdude: verification error, first mismatch at byte 0x0000
0x62 != 0x0c
avrdude: verification error; content mismatch
The message appears every time I try to upload any kind of program to the Arduino so I think it's a board problem.
If you have any suggestions or need more information please reply!
Read these posts.
Ok I'll try ordering an external ISP and reburn the bootloader with it.
I'll post the result.
PhiniphoeniX:
Ok I'll try ordering an external ISP and reburn the bootloader with it.
I'll post the result.
Thank you. Posting the results may help others with the same issue.
Everything solved here's what I did:
1 Ordered a USBasp from amazon (.it, url: https://www.amazon.it/gp/product/B01N2QBHG9/ref=oh_aui_detailpage_o00_s00?ie=UTF8&psc=1)
2 When it arrived I connected the 6-pin plug to the ICSP on the Arduino and the USB part to the computer (you have to have the Arduino connected too though)
3 I went to "Tools>Programmer" and selected "USBasp", then "Tools>Burn the bootloader"
4 I verified and uploaded "Blink"
5 Enjoy 
thank
yeah so i am too encountering the same problem with the error code
Arduino: 1.6.12 (Mac OS X), Board: "Arduino/Genuino Uno"
Sketch uses 4,420 bytes (13%) of program storage space. Maximum is 32,256 bytes.
Global variables use 483 bytes (23%) of dynamic memory, leaving 1,565 bytes for local variables. Maximum is 2,048 bytes.
avrdude: verification error, first mismatch at byte 0x0042
0xc2 != 0xe2
avrdude: verification error; content mismatch
avrdude: verification error; content mismatch
This report would have more information with
"Show verbose output during compilation"
option enabled in File -> Preferences.
this error started appearing when the battery was short circuited unintentionally around 2-3 times for a very short period of 1 sec max
this happened when the atmega was out of the arduino on a breadboard without any short circuit protection.
Though i am able to burn boot loader using another uno i have the problem still persists though the rx and tx lights blink as they used to do
This Means I can upload the program using other boad to the ATmega???
could I just buy a new microprossesor because I'm getting the same problem