My UNO was working fine, but all the sudden I cannot upload anything to it. Problem uploading to board... avrdude: stk500_getsync(): not in sync: resp=0x00 avrdude: stk500_disable(): protocol error, expect=0x14, resp=0x51
I see that the L led flashes a few times, then the RX led flashes 3 times. But then nothing happens.
All I did is to build a very simple project from the manual. Seems like my UNO still has the previous project in its memory ("blinking LED") and keeps executing it. I cannot upload my new program :(