It doesn't matter how much you want that to work, it never will work. So trying to update the firmware on the ATmega8U2 through the ICSP header next to the ATmega2560 is just silly. The ICSP header next to the ATmega8U2 is connected to the ATmega8U2 and can only be used to program the ATmega8U2. It communicates with your computer over USB and with the ATmega2560 over serial. The ATmega8U2 does have USB capabilities. ![]() It does have serial communication capabilities but that's different than USB so you can't just connect the serial lines directly to the USB on the computer. The reason this is necessary is because the ATmega2560 doesn't have any USB capabilities. The purpose of this chip is to act as a bridge to allow the computer and the ATmega2560 to communicate over a USB cable. The other microcontroller is the ATmega8U2. The ICSP header next to the ATmega2560 is connected to the ATmega2560 and can only be used to program the ATmega2560. The one you are usually working with is the ATmega2560. There are two microcontrollers on your Mega board. I think you need to take a minute to understand what is going on here. avr8x_mega)Īvrdude: Yikes! Invalid device signature.ĭouble check connections and try again, or use -F to override avr8x_mega) (retrying)Īvrdude: Device signature = 0xffffff (probably. Reading | # | 100% 0.03sĪvrdude: Device signature = 0xffffff (probably. Lock 0 0 0 0 no 1 0 0 9000 9000 0x00 0x00Ĭalibration 0 0 0 0 no 1 0 0 0 0 0x00 0x00ĭescription : Atmel STK500 Version 1.x firmwareĪvrdude: AVR device initialized and ready to accept instructions Memory Type Mode Delay Size Indx Paged Size Size #Pages MinW MaxW ReadBack ![]() System wide configuration file is "C:\Program Files (x86)\Arduino\hardware\tools\avr\etc\nf"Īvrdude: stk500_recv(): programmer is not respondingĪvrdude: stk500_getsync() attempt 1 of 10: not in sync: resp=0x03 This is my message after executing the command: C:\>C:"\Program Files (x86)"\Arduino\hardware\tools\avr\bin\avrdude -C"C:\Program Files (x86)"\Arduino\hardware\tools\avr\etc\nf -v -p atmega8u2 -c stk500v1 -PCOM4 -b19200 -U flash:w:MEGA-dfu_and_usbserial_combined.hex -U lfuse:w:0xFF:m -U hfuse:w:0xD9:m -U efuse:w:0xF4:m -U lock:w:0x0F:m Initially, I've done it like your photo, however, didn't work either.
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