microcontroller - AVR unable to enter programming mode - Electrical Engineering Stack Exchange
Configuring Atmel AVR Studio 4 to Communicate with the STK500 - Robot Room
AVR STK500 User Guide
Failed to enter programming mode. ispEnterProgMode: Error status received: Got 0xc0, expected 0x00 (Command has failed to execute on the tool) Unable to enter programming mode. | AVR Freaks