Please help! Sunfounder Mega 2560 won´t go into DFU-Mode

General Discussion
1

Hi, i´m trying to set my Sunfounder Mega 2560 into DFU by shorting the two pins next to the USB controller but it only restarts and won´t go into DFU-Mode. I also tried other pins but whatever i do, it just restarts.

here´s a picture of what´s suposed to do the trick:

[Album] imgur.com

Any help would be greatly appreciated, thanks!

2

What issues are you experiencing with your Mega board? Unable to upload code properly?

The USB communication on the Mega 2560 is controlled by the ATmega16U2 chip.

Correct Steps for ATmega16U2 Version:

  1. Short the RESET and GND pins on the 16U2 chip (usually two small holes or labeled solder pads near the chip), not the main MCU (ATmega2560).

If Still Unable to Enter DFU Mode:

You can bypass DFU and flash the firmware directly via the ISP interface (6-pin header):

  • Use a USBasp or another Arduino as an ISP programmer.
  • Connect to the board’s ISP pins (MISO, MOSI, SCK, RESET, VCC, GND).
  • In Arduino IDE, select:
    “Sketch” → “Upload Using Programmer”.
3

Thanks for the reply,
i did short the pins but it doesn´t go into DFU-Mode and just restarts, i was wondering why it´s not behaving as expected and how to solve this problem. I was hoping to find a solution without buying additional hardware.

is there a version which doesn´t have the 16u2 chip? if yes, maybe i got “lucky” and tha´s why i can´t get into DFU-Mode.

Just for info, i need to get it into DFU-Mode to make it a Midi Device.

4

our Mega 2560 board is unable to enter DFU mode.

5

Thanks for this definitive answer :slight_smile: