Omffffggggg I suspected the same ....
ok, so, is there any way to burn the bootloader without any other device? Just with the computer, with Mac OS X? I believe not but ... I am newbie with arduino.
And other question. Why this can be possible? Overwrite the bootloader uploading a sketch with the arduino ide? Do not has the arduino IDE any protection to not overwrite the bootloader when you try upload a too much big sketch? How can avoid this to not happens again?
Thanks.