user3761: I have been using my arduino uno for many months and it worked very well even till today morning but an hour ago I tried to upload a sketch and arduino IDE showed my this "avrdude: stk500_getsysc(): not in sync: resp =0x00" , at first I thought maybe I burned my atmega32 chip but I bypassed reset and gnd with a jumper wire and opened serial monitor and my atmega32 still printing serial data,so problem must be something else,and also my led13 isn't blinking.Is it problem with bootloader?if so how can I reload bootloader in my board without using another arduino?

user3638: I'm personally not really in to this RTFM kind of answer, but in this case it really do answer most of your questions about the bootloader part: http://arduino.cc/en/Hacking/Bootloader
About the error, a quick search on SO gives you this: https://stackoverflow.com/questions/24240285/arduino-nano-3-avrdude-stk500-getsync-not-in-sync-resp-0x00

3761: <p>I have been using my arduino uno for many months and it worked very well even till today morning but an hour ago I tried to upload a sketch and arduino IDE showed my this "<strong>avrdude: stk500_getsysc(): not in sync: resp =0x00</strong>" , at first I thought maybe I burned my atmega32 chip but I bypassed reset and gnd with a jumper wire and opened serial monitor and my atmega32 still printing serial data,so problem must be something else,and also my led13 isn't blinking.Is it problem with bootloader?if so how can I reload bootloader in my board without using another arduino?</p>
 3638: <p>I'm personally not really in to this RTFM kind of answer, but in this case it really do answer most of your questions about the bootloader part: <a href="http://arduino.cc/en/Hacking/Bootloader" rel="nofollow noreferrer">http://arduino.cc/en/Hacking/Bootloader</a></p>

<p>About the error, a quick search on SO gives you this: <a href="https://stackoverflow.com/questions/24240285/arduino-nano-3-avrdude-stk500-getsync-not-in-sync-resp-0x00">https://stackoverflow.com/questions/24240285/arduino-nano-3-avrdude-stk500-getsync-not-in-sync-resp-0x00</a></p>
