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  • It's dead, Jim. A common issue when you short circuit seems to be that the ATMega16U2 chip dies in some way and the USB never works again. Commented Aug 15, 2017 at 20:37
  • Maybe you can check the answer in the following question to prevent it next time: arduino.stackexchange.com/questions/43188/… Commented Aug 15, 2017 at 21:22
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    hi, i tried uploading the sketch using an FTDI breakout board with 5V selected connecting as GND GND CTS not connected VCC 5V TxD D0 (RX) RxD D1 (TX) DTR To RESET after hitting upload the progress bar gets struct at 100% after taking too long i get this error :programmer is not responding avrdude: stk500_getsync() attempt 1 of 10: not in sync: resp=0x83 avrdude: stk500_recv(): programmer is not responding avrdude: stk500_getsync() attempt 2 of 10: not in sync: resp=0x83 goes about 10 attempts, is there anything wrong in my connection? Commented Aug 16, 2017 at 21:31