Arduino Mega 2560 16u2 doesn't get DFU mode

Hello, I am really very new to this and I just want to make a MIDI controller with arduino, I ordered mine and followed all the steps to be able to make it enter DFU mode and when I made contact with the pins nothing happened

Can I put it into DFU mode through software? I need to update the driver to use ATmel flip

here's the board


What steps ? to use a Mega as a USB midi device you need to upload a different bootloader to the 16u2 after which you can not program the atmega 2560 through USB anymore. it is not practical for beginners.

Just connect those pins and make it going into DFU mode and then update it with Atmel flip

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