Hi How can the seeedstudio v4.2 enter the DFU mode?

I try to make-a-Arduino-HID-Keyboard. There is need to have the mega16u into DFU mode for the hex to upload by FLIP but unlike the UNO R3 there is no DFU pin I can do. Any Idea please?

Hello, generally buy USBtinyISP to burn.

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